We got in about the same time when we went to WL. We checked in and then took the boat to CR and FW. My two little ones (4 and 1 1/2) both took naps on the boat, it was very relaxing after a morning of travel and by the time our room was ready, the kids were refreshed and ready for an evening of fun.
You're going to have a great time. We Loved the WL!