For me it's doing little things like leaving sweet notes, or picking up a little something that I said I liked but never got around to getting for myself, or just going out of your way to do something for someone you love.
This question was inspired by watching Teen Moms with my boyfriend. Gary brought Amber a scented candle and food from Cracker Barrel to give her a romantic dinner. My bf thought this was ridiculous, but as silly as it was, I still thought it was kind of sweet!
If you don't care, feel free to rant about what a bad mother Farrah is!