Want to find some outdoor friends

Want to find some friends who also like to play in outdoor, like biking, hiking, skiing, swimming, surfing, playing tennis and ping-pang, etc.
I normally doing these things during on one day of the weekend. My existing outdoor friend is about to moving out from the Bay Area, so want to find some new friends here to enjoy the outdoor time. Please let me know if you also like mountains, beaches and big trees in the nature.