Last day of school activity ideas?

Hi alll, like many of you, my last day of working at my schools is in about a month or so.

I was wondering if you have any ideas on a fun game or activity I can do for elementary/JHS as part of my 'last day'?

(For JHS, I work on a small island and so, I only teach about 15 students in total and will be inviting all grades in JHS to do the activity together.

Any ideas would be greatly appreciated! Thank you!