I've walked from the Hilton Garden Inn to Sea World,it's like a 5 minute walk to Sea World,the Rennaissance is right next door so it would be the same.There's a Hilton Vacation club hotel that's also very close.There are like two new hotels on the Aquatica side of International Drive,I think one is a Springhill Suites,even though these hotels are next to Sea World they're on the opposite side of the parks entrance.I'm also not too sure how convenient they are to Aquatica,they are on the Aquatica side but it seems a bit far away from the entrance.Another hotel that's a bit further away but might also be walkable might be a Sleep Inn on Westwood.I would look into the Hilton Garden Inn or the Rennaissance though.