No, you don't have to pay, but parking time is limited. You stop at the guard kiosk, tell them you have reservations...if it's a busy time of year, they will check your name off a list. Usually they will give you a 3 hour parking permit to put in your window & direct you to the appropriate parking lot. The monorail resorts are pretty particular about the 3 hour limit, and will tow cars left in the lots longer. We saw that happening at the Contemporary when we stayed there last January (even during a very slow time of year they were towing at Contemporary.)