Similar to the “Sip & Paint” (which are great by the way) what about some ceramic painting (bowls, plates, coffee cup etc) you’ll be able to buy the kits online or DIY it.
The murder mystery isn’t too much organised fun, but usually better after a few drinks & you get some cheeky ones aswell, we did one where the murder was set in a condom factory 😆
A scavenger hunt around the house/garden or the type where you have to figure out the clues to get closer & closer to the prize - use ChatGPT to do all the hard work.
If you need ideas for a lunch on the day with nothing planned, how about ask the guests to “bring a board” aka they bring a few bits/ingredients to make a grazing board, but it has to represent something about them (fav colour, job, hobby, their pets, recent holiday destination etc) and the bride has to match the board to the guest. That’ll fill a bit of time and sort lunch.
I know you’re already doing a cocktail class, but no need to stop the alcohol on day two, how about a wine tasting…. You can buy kits for this or do it yourself with a bit of research, you can make it into a game, winner gets to finish their favourite bottle.