A doctor's advice to lower your blood pressure and cholesterol levels should always be taken seriously. But taking care of your ticker isn't only about skimping on sodium, scouting antioxidant-rich foods in the supermarket, and scheduling long sweat sessions at the gym. (Search: What type of exercise is best for my heart?) You're allowed a little fun, too. Read on to discover how enjoyable activities, like laughing at a YouTube video, hitting up happy hour, and planning a trip to the amusement park can help keep your heart healthy and strong.