There are hundreds of wonderful tide pools along the coasts of Maui, Hawaii. The unique combination of lava formed islands with off-shore coral reefs turning into beautiful sand beaches offers a unique living eco-system. Their light green hue was used by the Mana Kai Maui resort for its colors on the horizontal plane.
Wear reef shoes or something to protect your feet from the sharp lava rock. Or just go to the Ocean Center at Maalaea were there is a living tidepool display.