We'll have a car so don't need transportation from our hotel, but many of the activities I've investigated offer only that option. For example, with rafting, do we have to go with a large group on a shuttle bus? Is there somewhere we can drive to that would set us off on a rafting trip with a guide? Joining other groups of people is fine, but I don't want to be on a bus stopping at hotel after hotel before getting to our destination. Also, is there somewhere on Lake Arenal that we can drive to and just rent a couple of kayaks for an hour or two? We'd certainly like to get out on the water in some form while in the area, but would like to do it in the most economical and time-conserving way possible (while staying safe, of course).