Batch beverages for a boat ride?!

I rented a boat for 12 with a captain for my B-day and am bringing all the beverages because I don’t want everyone bringing their own individual cooler bags & whatnot taking up space.

I’m trying to think of some kind of batch alcoholic punch or something that’s crowd pleasing and can be easily shared, passed around, etc., but my brain is too busy worrying about the whole thing being lame I CANNOT access the practice side of it to think through this.

Any thoughts or ideas would be much appreciated!