What are some ideas for Valentines Day, me and my boyfriend are in highschool...?

Ok so I know it is the day before Valentines Day, but today is my first free day in over a month so I would like some help please!!! My boyfriend and I are 17, and he sadly has hockey practice AND a game tomorrow, so we wont really be able to celebrate that much. I was thinking maybe to do something sweet and romantic for him at school, and then it would lead up for a fun night this friday or saturday possibly... We can't do anything like take a vacation or make dinner together since we are only in highschool, but because I don't have time to go buy something for him, what should I do???? Thank you all so much for your help, please answer!