@MrsBergs - not a lot of traction to your question. I think this is reflective of many people’s opinion of Nassau as a port stop. The ship is often pretty full during this stop.
And I haven’t seen a lot of reviews or reports of using tour guides or third-party vendors.
Some reports of visiting the Pirate Museum, a chocolate factory, a Junkanoo museum (the Jamaican music and dance style). People have walked to Junkanoo Beach for a water day. There are guides who will take you to a beach on the other side of the island.
Recently (maybe around Feb), there was a surge in gang-related violence (mainly directed at other Bahamians) which prompted an increased warning by the US State Dept. That would have scared some tourists - and could leave a long-lasting reticence by cruisers, even for years.
I suggest you check Viator/ TripAdvisor for activities. Also Shore Excursions Group. Cruise Critic covers the world of cruising beyond Disney, giving you more opinions.
Blue Lagoon does appear to have a nice beach set-up. One I expect to visit if ever in Nassau again. But they are experiencing the outfall of a fatal ferry/ water taxi event. Over time, it will be forgotten. The question is when will guests feel safe using the boat transfer again?
If you find an adventure for your family, please let us know.
The water in the Bahamas is beautiful. It’s a shame (for us tourists) that it hasn’t been packaged and presented in a way that allows us to enjoy it - while funneling tourist dollars into their economy.
Royal Caribbean is in the process of building a day-use facility near the cruise port for their guests (not included in cruise fare).
Hope you have a great cruise!