We made this day trip in january. If you pick a day when there are few or no cruise ships in St Martin then parking at the public ferry is much easier. I believe the first ferry leaves at 8:15 or 8:30. It is a less-then 30 minute ride to Anguilla. Customs is 5-10 minutes, cabs are available and plentiful right outside of customs. The ferry is $20/person each way. The customs fees total about $15/ person total for the day.They will take you to the beach of your choice, and will also come back to pick you up at a specific time if you request. So you could easily be on the beach about an hour after leaving St Martin. We have been to Shoal Bay, which is beautiful ,and last time went to Blanchard's beach shack on Mead's Bay. The food is excellent, the beach is beautiful, and 2 chairs and an umbrella for $10. Hope you have a great time