2 spots, sorted by rating within each category.
A full-day expedition (about two hours by boat from Siargao) into a labyrinth of limestone lagoons, glowing caves and hidden lakes on Bucas Grande Island. Small paddle boats thread through Hagukan and Magkukuob caves, and in season you can swim among thousands of harmless stingless jellyfish in the sanctuary lake.
A labyrinth of jungle-clad limestone domes, hidden lagoons and sea caves on Bucas Grande Island, entered by small boat through a tunnel that only opens at lower tides. Day trips weave between glowing caverns like Hagukan and Magkukuob (with its cliff-jump exit), and in season you can swim among thousands of harmless stingless jellyfish in a landlocked lagoon. It's the most otherworldly day trip you can make from Siargao.