Did you know you can take a free, 90-minute boat tour of the Port of Houston? Go to the Port of Houston's website, and check the Community Outreach page for more info. They even let you know if the boat is running late or on time. We saw enormous Russian tankers coming into the port. Cool.
Glass-Bottom Boat Shipwreck Tours | Munising, Upper Peninsula Michigan | "Lake Superiors natural underwater museum featuring a rare, fully intact, wooden sailing ship that was built before the Civil War and sits only a few feet from the surface of the lake."