We just got back from HHI a couple of weeks ago. It was wonderful. I took a walk on the beach in the early morning right before low tide- there were so many creatures to see and lots of shells! I had never seen a hermit crab in the wild before- or a live whelk (oh, no, I did once in the middle of the night in Hatteras- when my drunken uncle came in off the beach still wearing his lighted helmet and walked into the room where I was sleeping, intending to show someone else the live whelk he nearly shoved in my face, while at the same time blinding me with the aforementioned helmet- so I don't know if I really count that!) or a starfish.
We saw dolphins in Broad Creek while playing horseshoes. We saw a rainbow and watched a hummingbird visit the cuphea in the landscaping in front of our deck. I managed to find out what the cuphea was by asking at the nursery down the road and brought home 2 of them. They are now planted on the sunny side of my house so I can enjoy them everyday and hopefully keep the hummingbird that visits my yard coming around (it seems to like the rose of sharon in my back yard, but that will have to come down when we eventually redo our deck).
Oh, and my dh and I had dinner alone (together, but without the kids! it was our first date since April!) at Marley's Island Grille. We recommend it, especially if you're slightly adventurous and like food from around the world. Our dinners had thai, caribbean, and polynesian flavors.
Yes, we definitely enjoyed Hilton Head. I have no idea when we'll be able to go back, but I'm sure we will eventually.