Low cost/laid back rehearsal dinner idea

My sister is getting married in early June in Cape May, NJ. They are planning a very laid back, relaxed, beach themed wedding and will be saying their vows barefoot on the beach. Due to a multitude of factors, covid being a big one, money has started to become an issue and although the wedding itself is paid off they are worried about being able to do some form of rehearsal dinner. I am looking for ideas and suggestions for something that fits the whole theme of the wedding, is very laid back and fun and is on the cost efficient side. I know Cape May is not cheap but I know they wouldn't want to go to a fancy restaurant anyway so I am looking for out of the box suggestions. Thank you!!!