First Timer!

Hello! First time visitor to San diego..... Im going with 3 adults, and they are also visiting for the first time. I did some research on my own and I was looking into Torrey Pines. Question #1: Is it too much of a Hike? My uncle and aunt are around late 50s but they are open to a nice view, but I don't want to torture them if it may be too much. Will the weather be bareable? We are coming up in a few days.
Also; what do you guys think about Little Italy?? Is it a nice spot to take them? I'm also open to some food suggestions.. Interested in seafoods, mexican foods, asian cuisine as well.we have a car so we would be open to different options!

Any tips on things to bring, how to dress, and any additional can't miss spots in SD?

We are also going to La Jolla.

Anything will help!!!