Tom, if you find an answer, please let me know! We're signed up for Randi's Happy Horses, but kind of thought it might be fun to divide the tour up with a boat ride, lunch and some horseback riding! Randi said that the Stone Island Bay Cruise is very good. (She used to guide this tour.) I wish it was HER doing the horseback riding part of it!
I'm kind of torn because I have heard such great things about her!