The man wearing the white skull cap at the Hindu grocery store on Devon Avenue plucked a quarter from his pocket and began plunking it on a coconut. If it sounded too hollow, he explained, that meant it was too dry. This time, the fruit seemed fresh -- just like my trip to Chicago. My premise was simple: It's easy to get to Chicago these days. A couple tanks of gas. The dirt-cheap Megabus. Or round-trip airfare to Midway Airport at a generation-low $139. Hop on the "El" with your wife, and it costs $5 to clank and jerk yourselves downtown. It's almost too easy, especially to hang out downtown. So on this journey, I set strict ground rules. We'd stay downtown, but that would be it. No Michigan Avenue shopping. No deep-dish pizza at Gino's East. No Rush Street carousing. No Millennium Park. No gazing down from the Sears Tower, especially now that it's called Willis Tower. My wife and I would spend the long weekend exploring the city's vibrant neighborhoods. Because there are more than 80 distinct Chicago neighborhoods, and dozens of unofficial ones, I devised a workable game plan -- dedicating roughly one full day each to the South Side, North Side and West Side. (The east side of Chicago, of course, is Lake Michigan. But I'd be remiss if I failed to give a nod to the city's sumptuous beaches, to which I saw countless young folks on the El flocking with towels in their bag.) South Side: From left (Obama's house) to Wright The Secret Service has set up barricades blocking off Greenwood Avenue in Hyde Park, protecting President Obama's tree-shrouded red brick house. So we needed to exercise a little creative chutzpah to get inside the perimeter. A call ahead to Jessica Cavanagh, an office assistant at the K.A.M. Isaiah Israel Congregation across the street from the Obamas, led to a free tour of the imposing domed Byzantine synagogue built in 1924.

First, a friendly Secret Service agent waved us through the metal fencing without even checking our I.D.s or whispering into his wrist. It helped that Obama was at the White Sox-Nationals game in Washington, D.C., at the time. "He was home on Memorial Day weekend and we had a bar mitzvah and a wedding and it all went off without a hitch," Cavanagh said. From the temple's vegetable garden, there's a clear view of Obama's whitewashed wooden porch, an American flag fluttering in the breeze. A mile north, through Hyde Park's mixture of leafy trees and crisp brick architecture, sits a century-old testament to both Chicago's genius and its resiliency. A bicycle maker named Fred Robie hired a young architect in 1910 to build a house for his family. The low-slung brick home, now open for tours as a quintessential example of Frank Lloyd Wright's Prairie Style, was nearly torn down twice when the Theological Seminary wanted to raze it for a dormitory. The highlight of the $15 tour was Wright's central fireplace topped with open space, allowing you to look straight through the entire first floor. He somehow engineered twin flanking chimneys to carry the smoke up the sides. After spinach-feta croissants and iced coffees at the nearby Medici Bakery, we headed to the DuSable Museum of African American History, the nation's first black history museum. Call it dumb luck, but Illinois Gov. Pat Quinn just happened to be there, bestowing honors on the museum's 90-year-old founder, Margaret Burroughs. "This museum began in the neighborhood, in a house in 1961," he said, "and has become a living, breathing repository of African-American treasures." Not to be played by an election-year politician, Burroughs (wearing a multicolored sequin cap) seized the podium and demanded the name and phone number of the Quinn aide who would help secure grant money to expand the museum. Now that's real chutzpah, South Side style. For dinner, we hit a deliciously understated French restaurant, La Petite Folie, which sits off a strip mall plaza and serves entrees ranging from brace of quail with lavender honey to duck a l'orange nicely presented like a winning hand of cards. North Side: An ethnic hodgepodge

Evelyn Thompson doesn't have an office, let alone a cell phone. But take the El to the northern end of the Red Line at Howard Street and you'll find the guru of Chicago's countless ethnic grocery stores. From her white house in the city's northernmost neighborhood of Rogers Park, the feisty fireball and self-proclaimed "street kid" leads tours in her blue 1987 Volvo that will leave your head spinning and mouth watering. In her four-hour, $75-per-couple tours, she shows off markets and restaurants of Bosnian, Jamaican, Georgian, Belizean, Vietnamese, Ethiopian, Greek, Jewish, Persian, Croatian, Belgian, Indian, Korean, Bhutanese, Iraqi, German, Polish, Swedish, Thai and even Assyrian origin. "Oh, look, a new Peruvian place," she said, pointing to a strip mall on Clark Street. Highlight of the whirlwind tour was W. Devon Avenue in Rogers Park, basically the Tower of Babel laid on its side and paved. Every block brings another language, aroma and flavor. Yarush Pelskily, owner of the Argo Georgian Bakery, slid the lid off his tandoori clay oven and retrieved a cheese-filed pastry. Up the street at the Hindu-owned Fresh Farms International Market, shoppers picked out fava beans and bittermelons. Camel meat? Evelyn knows where to get it. In the Uptown neighborhood off Argyle Street, gentrification jeopardizes but hasn't claimed a thriving Vietnamese neighborhood, where older generations have retired and their kids are selling banh mi sandwiches and Vietnamese coffee. "All these neighborhoods pretty much feature an El station surrounded by retail," Evelyn said, standing below the pagoda-style Red Line stop at Argyle. "Go a few blocks out, and it's all residential." If Evelyn's pace sounds a little too frenetic, rentable bikes are everywhere. We pedaled an easy 10-mile loop along Lake Shore Drive though Lincoln Park, with its zoo, lagoons and conservatory. Like everywhere in Chicago, traffic can be irksome and bikers share lanes with inline-skaters, strollers and runners. A former ice skating warming shack has been turned into the trendy North Pond, a upscale seasonal gourmet restaurant that looks over the pond back to the Chicago skyline. We found a Chinese woman picking mullberries right off a tree behind the restaurant. She didn't speak English, but gladly shared her bag of bounty.