We regularly take our beachcats out to the islands to camp - that's just good fun! We take one oven grill
and a bag of charcoal, plus whoever wants tents (mainly for privacy) and sheets
and bottles and food
take their own! I'm glad you started this thread - it's reminded me I need to get on to arranging the next one.
Our yacht club also used to do an island rally once a year, and most used to camp on the beach, primarily because there was no-one sober and willing to taxi the tender
... there was only one for the whole club! (No-one knows where it is now, tho!)