OK, sorry for the confusion. Suggest you change your thread title to solo traveller to avoid any more misunderstanding.
Shore dives most anywhere will be unguided. Boat dives most places will be guided. Lots of people go to Bonaire and do lots of boat dives, all guided. Cozumel is guided because they are boat dives, except for a few house reefs as shore dives, unguided. Cozumel is also drift diving, which can be unsettling the first few times, trying to stay with the group. Many love drift diving; some don't.
You won't find many topside activities at night in Bonaire; the place is all about diving, not clubbing.