Trying to choose what kind of bikes to rent. We are a couple with a 2 and 4 1/2 yr old. Considering a bike with pull cart and a regular bike, but then I saw the Surrey bikes/buggies. They're the bench seat bike where the kids sit up front while we pedal. I was wondering which you see most of. And can you ride both on the beach? Also by looking on the map I see the road connects to Sullivan. Are both of these bikes seen or safe to drive on road, and across bridge to Sullivan?