After you arrive at Flamenco Beach, walk north along the beach and you'll soon come to a vivid relic of the now-defunct military presence on this island. A rusted tank, partly submerged in the water, sits on the sand. Colorful designs and symols have been painted on it, but it remains a completely (and intentionally) incongruous sight in this idyllic place. There is a second tank, not as colorfully painted and hidden behind the brush as you walk towards the submerged tank. It will be on a small hill on your left in the campgrounds area.
"These are pretty cool to see, but I don't think it's good to have metal corroding into their crystal clear waters. I think they should move it out of the water, and onto a hill, like the other one. Lots of cool artwork and graffiti. If you look inside the tanks, all you see is beer cans and bottles. Must be a popular spot to meet up with friends."
"This is my second time on the bio bay. This is a 'must see' for anyone visiting Vieques. One of the best bio bays in the world, and one of the few that illuminate year round. The glowing effect is hard to describe. It's better to just visit yourself and experience it first hand."