Sometimes the best dates are those where you do something outside together. Make your boyfriend's 20th birthday a great day with an active outdoor date. Go hiking in the woods and set up a picnic for him, rent jet skis for the afternoon or go swimming together. Have his friends join you for part of the afternoon or for cake later on if he wants more of a party for his birthday. Planning something fun to do together is a wonderful way to show how important he is to you.

People feel cared about when someone cooks for them, so for his birthday put together a romantic dinner. Make a full-course meal, dim the lights and light candles to set the mood. Wrap his present in an elegant wrapping paper and place it on his plate so it is there for him to open when he arrives for dinner. Cooking for someone is a personal effort with a lot of meaning, which makes his birthday dinner special.

People like to share the things they love to do with the people they love. Doing something he loves with him on his birthday, even if it is not something that interests you, is an intangible gift. Play video games with him, join him and his friends on the golf course or watch his favorite movie. Doing his favorite things for his birthday makes the day all about him, and he will appreciate the effort you put into making the day about making him happy.

A more romantic birthday idea is to give him a massage. Even if he does not have a lot of tension in his neck or back, it is still nice to be touched and rubbed. Taking time to give him a relaxing massage is a great way to spend his birthday evening. Get massage oils and light mildly scented candles to set the mood. Play some relaxing music and let your time together be just about making him feel good.