parking
Include it in your budget. While i hate to pay for parking myself, you just have to be realistic. Theme parks, like the airlines, catch you coming and going. You need to realize that no one is trying to help you keep costs down. If you rent a car at the airport, they will charge you outrageous fees. If you park at Ohare it will cost you a minimum of $16 a day in economy parking. If you drive downtown chicago, the parking fees are enormous. Then get back on the plane and pay your luggage fees. Sure these are rip offs, but your options are limited.