We know you have this idea that if she just gave surfing a try, she'd end up really enjoying it. It's one of your favorite things to do and you know she would get into it eventually. We hate to break it to you, but if she says she's not really interested, she probably means it! However, someone who is madly in love with you will go along for the ride anyway. She'll give it a try again and again, just because she knows it's important to you.
Whatever the activity - sports, games, obscure movies - your lady will be happy to join you. That's just how much she loves you. Obviously, this should also go both ways. If she wants to take you to salsa class or soccer practice just give it a try and see where it goes.