Vicki,
Thats cool to hear. Could you share some of the neat and interesting things you've seen or done around there? As I mentioned this will be our first time to the area so as much info and ideas I can take in before we get there would be great...
I'll list the things we've enjoyed..
day trip to Savannah.
Beach Nature Walk with the resort naturalist(I don't know if they have this anymore, but if they do, go, it was a lot of fun-they take you to the beach and the naturalist tells you all sorts of information-not dry or boring at all)
I learned to juggle because they had juggling lessons.
shuffleboard and ping pong and bike riding
Miniature golf
shopping
Drive into Sea Pines(on the island) and climb the lighthouse in HarborTown,, right nearby there is a huuuge playground. My kids loved it! Eat lunch outside at the Salty Dog. Get the hush puppies.
Dolphin tour-we went on a big boat, not kayaks--only because I am scared of sharks and can't quite bring myself to be in a tiny little kayak out on the water

-actually we went on the Shannon Tanner dolphin cruise.
Which brings me to Shannon Tanner-across the marina from the resort, singer, he's fabulous. we love him!
http://www.shannontanner.com/perf.html
We've done a bird watching tour of the resort(and I don't even like birds, but it was fun!), and the regular tour of the resort.
Pirates of the Calibogue-sort of like a family scavenger hunt.
Magic Tricks with B'Lou
There are LOTS of kids activities:
My kids have gone to Unbirthday Parties, gone on Marsh Adventures, made pillows, mugs, birdhouses, fossils, slime and Mickey Tie Dye Shirts among others.
They have all sorts of arts and crafts, they have pool games every so often.
Twice a week they have Kids Night Out. My kids love love love this! They started going when they were 5. One night is pizza at the resort and then they go to the movies.
The other night is pizza and then they do things like a scavenger hunt. 3 hours long.
The campfires are lots of fun, songs, s'mores, laughs.
Things on my to do list are the Hilton Head Island Tour the resort does and I also want to go to the Pinckney Island Wildlife Refuge to hike around
http://en.wikipedia.org/wiki/Pinckney_Island_National_Wildlife_Refuge..and maybe finally the kayaking if I can screw up my courage.
You get a weekly list of activities you can sign up for(or just show up depending) and I'd say there's a good 7 or 8 things at least scheduled throughout the day.
ETA: The cast members at HH are the best Disney has, I swear. You think they're friendly and nice and welcoming in WDW? Wait til you meet everyone here. The recreation staff is amazing with kids. They remember your kids names, they go out of the way to chat, they are fabulous. I feel totally confident leaving my kids in their care at the Kids Nights Out. The people are the best part of the Hilton Head Island resort.