We were excited to visit Marcos Island because of the Imelda Marcos cave where you can release the adrenaline junkie in you and go cliff jumping and then from there, swim out to the sea. It was our last stop of our Hundred Islands tour and take note, don't make it your last stop too. We couldn't go cliff jumping anymore because during late afternoon comes low tide and the water is too shallow to jump in. We still scoped the island out and swam to the cave. The cave was cool as the top is open and the sunlight streaks into the water. There's also a pocket of the cave where you can swim in if you like dark places, haha. There was a lot of floating Styrofoam though which was weird. Sadly, the cliff wasn't even that high as a lot of people have said. 20-30 feet? More like 10. :( I've definitely jumped higher but for people who are wary about cliff jumping, this height would be doable for you. It's nice to take a leisurely swim there though and you do see some tiny sea creatures whilst swimming near the shore. read more