Celebrating your boyfriend's birthday with dirty water hotdogs on a street corner is just plain cheap. Instead, surprise your boyfriend with a picnic basket of dogs and assorted condiments, homemade brownies, and a bottle of prosecco (delicious and cheaper than champagne). But use your discretion, because an open container ticket is not sexy. Take him to a spot (parks are free) with a great view of the sunset and an even greater view of you. It's cute, clever, and sexy. Oh, and cheap.