First of all, you do have to take your passport with you. Some boat tours take you over to Anguilla, also. Same applies on passport. They drive on the opposite side of the street there, so I would not recommend driving. I would hire a taxi and say you want to hit two beaches, maybe have a meal on the beach with some cocktails. Sunday is funday in Anguilla with lots of music on the beach. Your taxi driver will pick you up at your pre-determined time, and take you back to ferry. The ferry gets busier and busier later in the day. I like to float around on a noodle in Anguilla, so bring noodles if you like to lounge in the ocean.