Will be on 7 mile beach in November and want to know which is the best snorkel,tour to take
Will you be on the island for a week? A day? A couple of hours off a cruise ship?
One that my son has always enjoyed when we stay on SMB is RedSail Snorkel Safari which is via jet skis.
There really is no best. What do you want and what is your group like. Many smaller dive ops offer private snorkel charters as well. Depending on the size of your group, this might be a great option.
Not off SMB, but I found the sites Ocean Frontiers takes you to on their East End snorkel tour to be my favorites vs other areas.