I was so very disappointed when I realized that you can't sit in the hot spring. I also wish that more of the playground equipment PWPs were interactive in some way.
Jumping into the hot spring would be so cool! Ahh there are so many PWPs I wish we could interact with more! For example, maybe you could throw a coin into the wishing well (or fountain) once a day and it grants you a wish (kinda like wishy the star). This is a little far fetched but it would be awesome if you could actually go into the light house and windmill and design the interior! I wish there were more items we could interact with as well... perhaps villagers can request "dishes" instead of plain fruit and we can cook em up with some of the cooking/kitchen items through a mini game. The 3DS and Wii prompting mini games really opened up my imagination of other items that can be used as mini game portals *sigh* the potential!
I love a lot of the items you can hold like the throwing beans and pinwheel. I also always pick up dandelion puffs I see so I can blow em away! Dancing around the campfire in the campgrounds is a super cute new feature as well. It would be nice if we could do it with the firepit in our own town.