We have reservations for Sea Camp, arriving on a Sunday when the NPS has tours of Plum Orchard. The reservationist said that tickets for Plum Orchard should be purchased in St. Mary’s at the time of check-in for the boat to Sea Camp. Is this information accurate? And, if so, are there always spaces for the Plum Orchard ferry for those arriving on the island the same day? We’d hoped to arrive the day before, but Sea Camp was filled for that day. Thanks for any current information for the Plum Orchard tours for Sea Camp campers.