Projeto Tamar in Florianopolis is a small sea-turtle conservation centre near Barra da Lagoa, useful for families and anyone interested in the island's marine life. It gives a practical conservation angle to a destination many visitors experience mostly through beaches.
The exhibits are straightforward rather than flashy, but seeing the turtles up close helps connect the coast to the animals that use it. Combine it with Barra da Lagoa or the eastern beaches rather than crossing the island only for the centre.