One of the best ways to observe marine life without getting in the water is from one of two boat tours. The more relaxing one is the sunset cruise near the exceptionally clear waters of Klein Bonaire, where coral reefs, turtles and lots of underwater night critters are lit up by powerful LED lights from the boat. You can also book a more vigorous mangrove kayak tour on the eastern side of the island. Captain Paul and his staff are extremely knowledgeable and entertaining and can point out all manner of interesting species of ocean life.