When Curious George, the man with the yellow hat, and their friend Marco visit Professor Wiseman at the beach, they have many new experiences. They dig for clams in a tidal pool, swim with dolphins, and even bury some special treasure. But when the tide comes in and takes their treasure out to sea, George and Marco need their new knowledge of how tides work--and their new dolphin friend--to get it back. Includes bonus activity page with instructions for making your own ocean bottle