During our visit to Biscayne National Park they were temporarily unable to offer rentals, snorkling trips, or glass bottom boat tours. There are some repairs underway due to damage from the last hurricane. The park is 95% under water, so without those concessions being available you can't see much of the park. We were able to visit the visitors center, which was very nice and had some informative displays, we also walked the boardwalk path there which is just about a 1/4 mile walk.
During our visit we also attended a ranger program called gifts from the sea. I have to say that when we sat down for the program, I didn't expect much, however I really enjoyed the talk. The park ranger was very knowledgeable and made the talk quite interesting. There were many adults in attendance as well a children and it seemed that everyone enjoyed the discussion.
The one thing that kept me from rating this park higher was the fact that I had attempted to both call and email to make reservations for one of their ranger guided canoe trips, and never received a call back to confirm. I showed up at the time of the trip anyway, hoping to be able to still join the canoe trip, only to find that they were full with others who had reservations. I was a bit put off by the fact that I had also attempted to make reservations for the trip but was unable to due to a lack of follow-up from the park staff. We did receive great service however from those we met during our visit.
This review is the subjective opinion of a TripAdvisor member and not of TripAdvisor LLC.