My kids, at that age (and still now), really enjoy the bikes. The path is all concrete, and very level (no big hills or anything). There are water stations all along the way. It's a great way to see the whole island and get some unique photos. And--best part--it's very inexpensive (by Disney standards, anyway). I think it was like $6.00 an hour. But, everytime we get a bike, the CM tells us not to worry about watching the time, because they don't! So, even though it's technically an hour rental, you can keep them longer than that.