When our oldest was an infant, we spent a long week at Old Key West trying to get her to sleep in the Pak 'N Play . . . she just didn't want to sleep in that thing. I don't know what her issue was, but we lost a lot of sleep on that trip! After that, I found A Baby's Best Friend (
http://www.abbf.com/). You can rent a real, full-size cribs from them (along with a lot of other baby supplies). They deliver the crib to bell services, and then you can have bell services bring it to your room (tip appropriately of couse . . . especially if you're staying on the 3rd floor at OKW!!). The cribs are really easy to set up without any tools, and include all the linens. At the end of your trip, you just take it apart, pack it back up and have Bell Services come get it (again, don't forget the tip) and ABBF picks it up from Bell Services later that day. Its really easy. We rented from them 5 or 6 times and it was worth every penny. Just thought I'd share in case you need a "real" crib.
Best Wishes
Leslie