all day 🌸 the beach
You'll find yourselves at the aforementioned beach, should you not head over yourselves (why waste the chance, afterall?), with an appropriate outfit for the occasion... Or inappropriate, depending on your standards. The drinks stand is open and ready to take
More importantly, around the middle of the beach, there's a very large sand sculpture of an Usyagi, towering over a designated area where you can find buckets, shovels, and other things to build your own sandcastles! As the non-sand Usyagi will remind those who didn't check up on quests, anyone can join in and build their own. If you complete the task, you'll get a reward - and there'll be an extra prize if you manage to make a castle that's bigger and fancier than everybody else's.
Lucky for any grumps out there, this time nothing is forcing them to stay, or keep whatever clothes they end up with - unless you count the chances of earning bad konpeito for being a killjoy, that is. What? That absolutely counts as having a choice, doesn't it?]