For me North Carolina, Dallas and Omaha are the three best in the country since they do so well at recreating the environment of the pachyderms. I choose North Carolina because it is the largest and grassiest- I haven't seen Omaha in person but plan to in the near future. To be honest, I don't think San Diego, Lowry Park and Miami belong in the top ten and I would consider Fresno Chaffee (Africans), Reid Park, Los Angeles and Cleveland to be better as well as Saint Louis, Birmingham, Cheyenne Mountain and Kansas City which you did not mention.