There are two possibilities
Both possibilities require that it is somewhat organized in advance and requires a minimum number of couples (since you are essentially chartering the boat)
1. Arrange this in advance thru Desire - their cruise leaves from the Temptations dock early am and is a all day affair with lunch and shopping stops on Isla Mujeres. (transportation to and from the dock is included)
2.Arrange this in advance thru
http://www.baresailing.com/ - their cruise leaves from Puerto Morelos and can be any length of the day that the group chooses with onboard or shore lunch. (transportation to the Puerto Morelos dock is provided and on return they drop you right back at the Desire beach)
Our group (the YNOTS) have done both cruises and enjoyed both - however I would have to say that as a group we preferred the one from
http://www.baresailing.com/ more since we could specifically customize what the days schedule was to be
Please use the forum links to book directly with Desire RM, Desire Pearl or the Desire Cruises.
This will help keep the forums economically self sustaining and Ad free for all to use.