I love the Hilton Garden Inn Sea World. You can walk to Sea World from there. They have a shuttle too. They have a very nice small pool area and jacuzzi with plenty of lounge chairs and towels. The heated pool is very warm too, which I love. I stayed here for a three night Sea World get away in October and am coming back for another three night stay in March. The food from room service and the resturant for lunch and dinner is tasty and reasonable too. Rooms also offer a microwave and dorm sized refrigerator. Staff is super friendly and helpful. There are packages that include two Sea World tickets from the hotel website, if you don't have a flex pass. They also have breakfast packages, which you might want to do if you aren't doing the Sea World package (also on the hotel website) -- otherwise breakfast is expensive ($12 for hot breakfast // $8 for continental). Parking is free. Ocassionaly too rooms go on sale (not packages) but room only on Expedia. If you need two beds, note though, that they have doubles not queens. Even at full price, this place is a good deal, cheaper than the other properties that are walking distance to Sea World and very nice (a three star property in good shape). I was very satisfied, am going back for a second stay in March, and highly recommend this property.
When I booked in October I paid $130 a night for a Sea World package that included two free Sea World tickets. The Renaissance on their hotel website when I checked was much more expensive -- about $230 a night.