I believe the Renaissance is across the street to the north, and the Hilton Grand Vacation Club is across the street to the west.
I've stayed at the Hilton, but I didn't go to Seaworld at that time. It's not very far, but you would have to pretty much walk thru the the parking lot to get to the park entrance. I guess it wouldn't be much further than walking from one of the more distant parking spaces.