Happy late valentines!! So sorry Im late to this I was with my valentine on Friday!
What I think the 7 do for valentines Day!
(Warning for you grubs: Valgrace and Pipershel)
Percabeth: visit Percy's mom first, but afterwards Annabeth tells Percy she crafted him a scavenger hunt. They go through many places, Annabeth helping a little, and at the very last place- The beach house Percy grew up having his best memories in- Percy's turned to the sea for just long enough for Annabeth to get down on one knee. Nobody knew of her plans to propose (except Sally Jackson, of course)-- hell, they were fresh into college at New Rome!
Valgrace: Originally didn't plan to do much, but Leo got inspired by Annabeth and built Jason a tiny robot that every time it recognized his face, it played a recording of Leo saying stuff like 'Damn boy you looking fine' or 'I love you, Superman'.
PiperShel- They spend the day in watching crappy romance movies and eating chocolate they bought for each other. Simple and happy.
Frazel!! -Frank treats Hazel to a date, her favorite restaurant, desert, even went out to go try and find a copy of her favorite movie. The two are more than happy to wander around a city together, struggling to find a copy of a movie Hazel barely remembers.
Bonus! SunStar: Nico had never celebrated the holiday before, do he enlisted the help of the Aphrodite cabin. The cabin fixed him a basket of things to give to Will. Maybe 10 minutes after Nico left, Will came in asking for help with the very same thing. When they exchange gifts, they both notice the handwriting on the tag. They share a laugh about it, and watch Star Wars together.