The ferry can get really busy, and the lines to board can get pretty long. It runs more often in the summer, and there is a good ferry schedule online. I have found that earlier in the morning, lines seem to be shorter getting to the island, especially on one of the days people check in and out. Most folks don't want to take a day trip like that when they first arrive or when they are getting ready to leave. Late morning seems the busiest; I think because people have gotten up, eaten breakfast and decided what they are going to do for the day. The whole process runs really smoothly, and it's fun to get out of the car and walk around the ferry while it's moving.