I would not recommend doing a SAN turn for observations. yes its a short flight and most guys just want to get them done with but the whole point of the observations is to learn a little bit. SAN is so short that you won't even catch half of what is going on and you won't have any time to ask questions. take a flight over to LAX and then do LAS or SJC or SMF. they are all about an hour flight and you will have a little more time to see things and ask question and still make it back to PHX the same day.