My family vacations for 20 years have been to Hilton Head - it's a beautiful place! I've never stayed at the Disney resort there, but have visited it just because it was Disney. It's very nice & is in a great location.
Some of my favorite restaurants nearby:
-Aunt Chilada's (family fave)
-Truffles
-Marley's
-Wild Wing Cafe (great for lunch!)
-Old Oyster Factory (beautiful setting)
-Salty Dog Cafe
-Kingfisher
There's no shortage of great restaurants. I myself am not a seafood eater, but it's all my family eats, so the restaurants I named have both available.
As for sightseeing - don't miss Harbor Town. It's got the lighthouse, great little shops, and a beautiful marina. Other great places to see would be Coligny Plaza, Sea Pines (especially South Beach Marina w/the Salty Dog Cafe), and Shelter Cove. If you decide to take any dolphin sightseeing tours (they can be a lot of fun & are very relaxing), they will probably take out of Shelter Cove so you can check it out.
The Hilton Head beach is my favorite beach. When the tide is out, the beach is enormous. Most often you can see dolphins close to shore, but it's more likely in the morning. If you like to bike, absolutely rent a bike! There's bike paths all over the island, or you can ride on the beach. My husband & I spend more time biking & eating than anything else on the island.
Have a great time! PM me if you have any questions about anything I mentioned. HHI is like a second home to me.
-jamie-