Lord of the flies if your just a jerk and know one likes you.
Even if the trip organizer/leader is likable and competent, well-prepared and has good people skills, a previously untried group new to each other is fertile ground for conflict due to human nature.
Out of 10 or 12 people, what are the odds there's at least one Karen? At least one entitled narcissistic guy who makes biting comments? Someone like that can ruin a day for everybody. A compatible couple or pair of couples may be far more practical.
When I was researching for a family trip to Walt Disney World, the
Unofficial Guide to Walt Disney World got into the need to plan for the potential conflicts of family dynamics unfolding in a strange place with an over-stimulating environment. And that's a smaller group that know, love and are committed to each other.
We love off the beaten path dive/snorkel ops
Who's we? Will some of these people know each other and have traveled together before?
Richard.
P.S.: When someone formulates a dream and hopes to make it a reality, discouraging critical commentary from anonymous strangers online can come off as abrasive. Please understand I'm not interested in insulting you, and at heart I think we're all mainly concerned with providing realistic feedback.
Elsewhere I've noticed group organizers sometimes take a 'pilot trip' to try out a proposed destination 1st hand, before they start taking trips there. Work out the kinks, make sure it's as good as they say.