Depending which city park ponds you fish, a dropshot isn't always a good idea, due to the shallow and yuky bottoms on some of those ponds/lakes.
I've fished just about every city park lake in so. cali on a regular basis, and I can tell you that your best bet a t rigged 6" Robo worm with purple in it, Legg lake for example that worm on grape is killer.
Alondra, El Durado, ect the t rig with a 3/16 or 1/4 oz weight, will work, another good bait is a 4" robo worm in hologram shad. Rig it with a 3/16 oz split shot about a foot or so from the hook, the worm in this case should be nose hooked.
The fish you see in my avatar was caught at El D, on that same split shot rig.
Keep in mind, other baits will work, but not as consistent as the ones I mentioned.