The extensive concessions available on Pea Patch Island consist of...this drink machine. One is warned that this is the case before embarking on the ferry from the mainland, and I was able to purchase a GoPicnic™ boxed lunch at the gift shop on the Delaware side (those things are awesome, I highly recommend them), which I carried in a cargo pocket. What an awesome picnic spot though, right? No time for boxed lunching: The ferry leaves in an hour, and I have a LOT left to explore.