We rented the dune buggies and had so much fun. One of the dune buggies was an automatic. The front seats are way easier to get in than the back seat if you get a 4 seater. Basically you step on the seat, hold on to the roll bar, lift other leg and scoot down into seat.
I was able to get into the back seat (not a pretty site the first time but it got easier). My 77 year old dad was also able to get in the back seat.