I imagine you are talking about the SoCal
CityPass. It's a rather good deal if you go to Disney 3 days and at least SW or USH. You can add on the SD Zoo, but it starts lowering the amount you save. But still worth it if you do 3 disney days, that's what most of the savings is from, USH or SW and the Zoo.
You can get them with either the Zoo or Safari Park, a choice of two great places to visit. To get that option you have to buy it direct from CityPass.
Assuming you have been to SW Orlando and that why SW San Diego doesn't sounds great I would give the edge to Orlando because it has an extra exciting coaster that SD doesn't have.
What you may want to do is a Citypass with the SD Zoo. Do Universal one morning skip some of the things Florida has, and visit Hollywood itself or another area attraction. Do SW one day and just hit a few highlights, then go to the Zoo which is a few miles away or do this in reverse. Then do three Disney days or break up the Disney days with the other sites.
I understand it may seem like just more Disney. DL packs almost as much in those two tiny parks as WDW has spread out over four. DCA has 4 attractions that are at WDW, Soarin, Muppets, ToT and ITTAB the rest of the park different. DL has several attractions not at WDW, and many that are in both like POTC, and Space Mountain are different. Some attractions obviously better some worse, many just different. If you find you are there and getting bored just hop in the car and go elsewhere after the morning.
What are some of things that are not in theme parks that you want to fill your days doing? There is plenty in the area to diversify.