There sure are, my friend! I'm out on Oahu, and there's tons of places to go... I hear that on the big island the wheeling is the best, mainly because the big island is, well, so much bigger than all the other islands!
You can also rent 4-door Wranglers here, on Oahu at least, so I mean, you put 2 and 2 together
When are you thinking of coming out?