You booked the flight, you got the hotel, the rental car – maybe you even figured out how much your food costs are going to run you on your upcoming summer vacation. You're set, you're done, no surprises. Right? Well, maybe not. As we too often find out when traveling these days, the cost of the trip is not necessarily, well, the cost of the trip. Little fees, taxes, charges and surcharges pop up along the way, sometimes so often that before you're even in your destination, your budget has been all but blown up. Hitting the road? Keep your eyes peeled for these eight, often very expensive travel fees. With a little extra effort, many of them can be avoided.