The La Vista Memorial Park web site is at http://www.lavistamemorialpark.com/. There are location maps and photographs of the park and the setting on the site. The phone number is 619-475-7770. I visited the park yesterday, and took some photographs. Here is the entry gate at Orange Street and 32nd Street:
The cemetery office is located in a relatively small building. At the front desk, you can ask for the location of a grave, and the attendant will look in a card file, find the record, make a copy of it, and then look in a map book to determine where the grave is located. If the attendant is not busy, s/he will take you out to the grave site. Here is the cemetery office building.
Just east of the office, there is a Grand Army of the Republic memorial and there are gravestones of probable Civil War veterans nearby. There are also gravestones for more recent military veterans nearby. The GAR memorial is shown below: