I'm not sure why the Hilton has such a limited choice of restaurants. They seem to let the guests leave their property for better choices nearby.
Having said that, the Lagoon Grill is a nice place to have lunch because you can watch the dolphins while you eat. I had an ahi burger that was cooked properly and was good. My wife had the swordfish sandwich that was overcooked.
If you go to the Hilton, don't forget to have your parking validated, and make sure you ask to see the shark tank.
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