One of my favorite sites for cute, free printables is The Dating Divas. They have so many cute things and ideas on their site. Most of their ideas can be done for free which is way awesome. Every month they have Love Calendars that give you daily things to do to show your special someone that you care. One fun idea that I found on their site were these cute printable notes to put on snack foods. I don't know about your resident, but mine loves having snacks around so this is perfect for him!
Craftionary has 75 fun Valentine's printables ranging from little love notes to cute subway art prints that you can decorate with. There are even some cute party decorations and games you can print.
Our Best Bites has several fun Valentine's activities plus its a cooking site so its full of yummy treats for you to make for your sweetie! Some of my favorites from them are their printable Valentine's that have writing prompts. They also have a super cute tutorial for a heart garland made out of felt, buttons, and ribbon. That one is obviously not free but felt and ribbons and buttons are super cheap so I'm letting it slip in.
Classy Clutter is another site that had some fun ideas. They have some cute printables to make a fun banner. They also have several yummy recipes for Valentine's treats and a tutorial to make your own fortune cookies for Valentine's Day. How fun is that?
I hope that you can find something fun to do for Valentine's Day without breaking the bank.