If you recently booked a great deal on an online travel site like Expedia (NASDAQ:EXPE) or Priceline (NASDAQ:PCLN) but checked out with a much higher price tag than expected, you’re not alone. The hotel industry is in the midst of a record $1.8 billion fleecing of guests through hotel fees.

Not content to gouge you $5 for the Almond Joy in your mini-fridge, hotels have added a slew of unsavory fees and charges — a few not even disclosed until you’re halfway out the door — for services widely expected to be included in the basic hotel experience, and some for services most people never use.

So what grubby hotel fees should you be looking for in the fine print when you get your key card? Here’s five ways hotels are nickeling-and-diming guests:

Mandatory Gratuity Fees

My dad taught me to always leave money for the maid, tip anyone who handles my bag and be generous to those with unglamorous hotel jobs. But the overlords at Atlantis resort in Paradise Island, Bahamas, apparently have decided the tip jar should be mandatory.

According to Atlantis’ website, “guests will be required to pay a mandatory gratuity and utility service fee of (i) up to $22.95 per person per day for Atlantis guests, (ii) up to $17.70 per person per day depending on unit type for Harborside Resort guests, and (iii) up to $62.95 per person per day depending on unit type for The Cove or The Reef Atlantis guests.”

Sadly, this type of hotel fee is neither isolated nor new: In 2007, Jim Schulevitz sued Starwood Hotels (NYSE:HOT), which owned the Phoenician hotel in Scottsdale, Ariz., that charged him a $4 daily tip for the maid and a $28 bellhop tip.

Utility Service Fees

Let’s go back to the Atlantis hotel’s “Utility Service Fee.” Imagine checking out and seeing the clerk hold out a hand, saying, “Hey, bub. Water ain’t free.”

Of course, water is a cost. But you don’t see your restaurant bill itemized for gas in the oven or electricity for the mood lighting.

Airlines have made a habit out of nickel-and-diming extras. But a guest might have a slightly easier time digesting “utility” bills from a fleabag motel instead of a posh resort like Atlantis, where you’re shelling out a minimum of $249 to $889 per night, depending on what building you’re staying in.

Resort Fee

If a resort fee went toward paying for things you wouldn’t get in your basic hotel, it could be justified. But MGM Resorts International (NYSE:MGM) charges a $20 resort fee at the MGM Grand in Las Vegas that includes business center access, in-room Internet access, a newspaper, local and toll-free phone calls.

Not exactly an exclusive poolside patio.

And it’s not to make up in any shortcomings in the room cost. That fee applies for even the bargain-basement one-night, two-adult stay in the Deluxe Grand Tower King Room for $220.

Safe Fee

This cost isn’t exactly skin-deep. When a hotel charges you a $3 safe fee, on the surface it sounds like you’re paying for a metal box in your room. Instead, what you’re paying for is up to $5,000 in insurance for whatever you choose to store in the safe.

The real rub is how this particular hotel fee is addressed. Numerous hotels, including those under the Choice Hotels International (NYSE:CHH) banner, charge the fee without notifying the guest, and only remove it afterward — at the customer’s request.

Which would seem a boatload less dishonest if the following weren’t the common in-room safe experience for 99.9% of hotel guests:

Mini-Bar Restocking Fee

Hotel mini-bars are notorious for their sky-high sticker prices.

But what you might not know if you succumb to the rumbling in your stomach is that you can be hit with a $6 “restocking” fee on top of the per-item costs.

Hospitality expert Bjorn Hanson says you could pay up to $5.95 in fees despite throwing down $2.50 for the drink.

As Hanson understates, “It makes for an expensive can of soda.”