Taking baby to the beach

What are yours must haves for taking your baby to the beach!? My parents live in Florida and we only visit once a year in the summer. We plan to go the first week in August when my LO is 10 weeks old. What should I take with us that can help make the beach/pool/heat the best experience possible. We will be minimizing the amount of time he will be outside due to how little he is, but any advice would be great!