Which is the best place to play Badminton during the Weekends in san diego? and also not that crowded..
The two main places I can think of is BPAC in Balboa Park and the Main Gym in UCSD on Saturdays. The BPAC site can be found here: http://www.sandiego.gov/park-and-recreation/centers/bpac.shtml The UCSD open gym is 6p-10p on Saturdays. Sundays are team practices, so rec players are not allowed.
You have found the group page but just for the benefit of others, http://groups.google.com/group/sdbadminton