Is that Valle Lindo Park in the background of your profile picture?
I play there monthly. :)
Since your new to Simi, Rancho Simi Park is the best place to play a pick up match and there is 1 large hitting wall too. I'm have a cold now. Contact me in about 1 week to play. I'll also introduce you to other 4.0+ players and know the cpt. of our local USTA team.
There is also, a Simi Tennis Group on this site with about 20+ members :(