The "guidelines" post did in fact start out a lot longer. Along the way someone else edited it, and then it got chopped off - not sure how that happened.
It used to have some So Cal trail guidebook listings in it too. They had several ideas for easy day drives around San Diego.
I don't think I'll be available, but you could also think about going to the fire lookout tower on the top of Los Pinos Mountain. The road up is paved, but still, the views are really nice. Pine Creek Road going up into the Lagunas is nice too. It's also more or less paved, but again, nice scenery. There is an unpaved portion where you can find an old arrastra (thing they used to grind gold ore with) and a few other historical bits. It's a spur off off Pine Creek, out and back the same way since the unpaved road ends at private property.
If you do wind up in the local mountains it could be pretty warm and dry up there.
It sounds like Jay has some good ideas. If you need more, and want to talk over a cup of coffee let me know. It's not like you are all that far from me.