Ocracoke is awesome! By far one of the neatest places I have visited in the RV. Not sure what it is, but something about it just appeals to me. I like it because it's *not* crowded and crazy and overly touristy. A walk from the airport to the center of town (if you can call it that) is doable, but may be a long walk for folks that are out of shape. Once you get to town there are plenty of bicycle rental places...and don't worry -- you will definitely fit in on a bicycle -- they are everywhere. There are no bridges to Ocracoke so most folks that are there seem to come on the ferries without a vehicle and use bikes to get around.
The bicycle shop that we rented from actually brought us back to the airport in their personal car. Nice folks.
BTW: This would be *the* place to take a folding bicycle if you have one.