The summer is a high travel season, and companies are known to bump up fees on everything from airfare, hotels, car rentals and much more. Many people are unaware of these hidden fees, and it can ruin your vacation fun. Kiplinger, a Washington, D.C.-based publisher of business forecasts and personal finance advice, reveals a list of tricky fees to watch out for when traveling this season.

Here’s a preview of what you can find on Kiplinger’s site:

• Frequent-Flier Fees: Even frequent-fliers can’t avoid facility charges, security fees, and rush fees, but Kiplinger provides the know-how.

• Stealthy Cell Phone Fees: Ever heard of “cramming?” You may fall victim to unexpected dues on your cell-phone bill this month. Kiplinger reports on just what you’re being charged for and what you can do to fight off these fees.