That would be me! RVing Toadless!
I have rented cars from Enterprise, they deliver the car to you. I have contemplated joining ZIPCAR (http://www.zipcar.com/
) but this option only works if you are RVing in major cities, like Chicago, Seattle, Portland, New York, Minneapolis, you get the idea..... But if you do hang out in a lot of major cities, Zipcar may be a good option, I think it's a pretty low joining fee and it's a "car sharing" service.
I don't think the golf cart idea is a good one. Now, I use my scooter (electric scooter, runs on a battery), but it's only good on surface streets, can't take it on busy freeways. If you check my blog, I found the idea of the "refurbished street legal bumper cars" quite amusing! Apparently, this is popular in California!
My scooter isn't required to be licensed in my state, and I don't think most states require a license for it. Some might. On the other hand, you could buy motorcycles of 50cc. Those may or may not require a license depending on the state, but wouldn't require the motorcycle endorsement to your driver's license. But again, I wouldn't take those on the freeways. Those motorcycles can be carried on special made motorcycle carriers that go in the receiver hitch. I don't have an issue with those, I am just too chicken to tow a car!
The last option is to get one of those regular bicycles that is retrofitted with a motor so you can optionally not have to pedal. I've seen some of those.