Ken and Shiela,
We've stayed at Sweetwater Regional Park.? You need to know it's also a park for horsecamping so there will be horses there.? When we stayed there we had the horses and a truck camper.? I wasn't all that impressed.? If I remember the sites are small.? I can't remember any hookups either.
There is another relatively unknown park off of Highway 52 near the #15 & 52 junction called Santee Park.? They have full hookups.? It's not as lush as Chula Vista; but it's in a good location, is a lot less expensive, is gated and near Mission Trails Regional park which is a nice place for hikes.? It's more north of San Diego whereas Sweetwater is east.?
Let me know if you need any more information, we live just north of San Diego.
Marsha~