We have decided we might like to try one of the two island tours offered for snorkeling when we visit in Oct. It seems that there are two companies that offer what seems to be the same tour, just about. These are Sevis Tours and Pro Excursions. Has anyone been on a snorkeling tour with one or both of these companies? They both seem to be very good companies, mainly good reviews with a few bad mixed in. Just looking for a little something to put me over the edge with one or the other. Thanks!!