Hmmm. I think they would probably really enjoy it, even at that age. My youngest was 7 and she thought it was pretty darn cool. As for the towncar, I reserved it through a company that our agency recommends. I can't mention it here because they are not a DIS sponsor, but you can pm me. I think a taxi would be okay for two people, but they want to charge you per person, so for more than two, the towncar is cheaper. I suppose you can haggle some with the taxi drivers, but I've never had much luck with that. We had the same experience on this last trip of two weeks ago - we never did hook up with the other three girls at the parks. Just couldn't make it work.