No 2. The Peninsula, Chicago: The BarAverage Cost Of Martini: $13House Champagne: Champagne Deutz, $18 per glassHead Bartender: NA; Bar Manager: James PierceHours Of Operation: Monday - Thursday, 3 P.M. - 1 A.M.; Friday, 3 P.M. - 2 A.M.; Saturday, 12 P.M. - 2 A.M.; Sunday, 12 P.M. - 1 A.M.Clientele: Hip locals, businesspeople and hotel guests, mainly in their late 20s.No 3. Four Seasons Hotel: Houston, Lobby LoungeAverage Cost Of Martini: $9House Champagne: Gloria Ferrer (sparkling wine), $10 per glass, $44 per bottle; Louis Roederer (true Champagne), $16 per glass, $72 per bottleHead Bartender: Benito GarciaHours Of Operation: Monday - Thursday, 4 P.M. - 12 A.M.; Friday, 4 P.M. - 1 A.M.; Saturday, 5 P.M - 1 A.M.; closed SundayClientele: Business professionals and well-heeled members of the theater/opera set, as well as sports fans on game nights.No 4. The Peninsula, Beverly Hills: The Club BarAverage Cost Of Martini: $11House Champagne: Veuve ClicquotHead Bartender: Shannon RonaldsHours Of Operation: 12 P.M. - 1 A.M. dailyClientele: Entertainment moguls, finance execs and local residents mingle starting at 5 P.M. for happy hour. The late-night bar crowd comes around 10:30 P.M.No 5. Four Seasons Hotel: Miami, 14-Thirty-FiveAverage Cost Of Martini: $12House Champagne: Louis Roederer Brut Premier. Reims NVHead Bartender: N/A Bar Manager: Gary TimmonsHours Of Operation: 4 P.M. - 11 P.M. Sunday - Thursday; 4 P.M. - 12 A.M. Friday - SaturdayClientele: Hotel guests (business and leisure travelers) as well as a younger crowd who comes after working out at The Sports Club/LA Miami, which is located in the same building.No 6.The Carlyle: New York, Bemelmans BarAverage Cost Of Martini: $13House Champagne: TaittingerHead Bartender: Audrey SaundersHours Of Operation: Monday - Saturday, 12 P.M. - 2 A.M.; Sunday, 12 P.M. - 12 A.M.Clientele: Very eclectic and mixed--some young, some older, some celebrities, some locals--attracted by the piano music and Ludwig Bemelmans' whimsical muralsNo 7. Intercontinental Mark Hopkins:San Francisco, Top of the MarkAverage Cost Of Martini: $10House Champagne: Domaine ChandonHead Bartender: David MajorHours Of Operation: weekdays, 5 P.M - 12 A.M.; weekends, 4 P.M. - 1 A.M.Clientele: Diverse crowd, mix of tourists and professionals. Primarily people in their late 20s to late 60s. Best views in town. Martinis are pretty darn good, too.No 8. Fairmont Olympic Hotel:Seattle, The TerraceAverage Cost Of Martini: $10.50House Champagne: Moët ChandonHead Bartender: Michael VezzoniHours Of Operation: Sunday - Thursday, 11 A.M. - 12 A.M.; Friday and Saturday, 11:30 A.M. - 1 A.M.Clientele: Mixture of travelers/tourists and local business people. Age varies, but odds are you'll be able to tell the Microsoft employees from those who work for Boeing.No 9.The Windsor Arms Hotel:Toronto, Club 22Average Cost Of Martini: $7.55House Champagne: Veuve ClicquotHead Bartender: James SkwarekHours Of Operation: 12 P.M. - 2 A.M. dailyClientele: Very eclectic mix, lots of celebs and rock stars. Some businesspeople, locals and couples. A very cool, hip place, with attractive young people and thirtysomethings.No 10. The Hay-Adams:Washington, D.C. Off the Record BarAverage Cost Of Martini: $11House Champagne: Piper SonomaHead Bartender: John BoswellHours Of Operation: Sunday - Friday, 11 A.M. - 12 A.M.; Saturday, 11 A.M. - 12:30 A.M.Clientele: a lot of White House staffers and White House press corps; primarily people in their 30s and 40s.