Most people are not aware, but you can go sledding in San Diego. Yes, snow is not involved, but who imagined large blocks of ice on smooth, manicured grass slopes can pick up so much speed? Steering and braking are a little tricky, but otherwise it's quite the ride. The below photo is of friend Peter Buotte, at a park just a few minutes from our home.
For the more adventurous you can also skydive at a place just 15 minutes east, hang glide 20 minutes northwest, and of course surf and kayak anywhere along the coast, just 8 miles west as the crow flies.
And if you have to have snow, in the Winter it's just an hour a way.