You don't say when you're going, but there are the San Jacinto mountains, the San Bernadinos, and the San Gabriels. In any of them, you could follow the PCT for a ways.
In the San Jacintos, you could put together a series of short hikes during the day to camp at a different spot each night. You could do it either from the Palm Springs tram, or from Idyllwild. Right now there's a fair bit of snow, but later it gets quite hot up there.
Camping in the San Bernadinos is pretty restricted.
In the San Gabriels, there are a number of trails that tend to wind up and down canyons/creeks, that could give you some good hiking. In fact, speaking of Bridge to Nowhere, you can do that as a shuttle hike from on top - though I don't know what shape that trail is right now, or even if the road is open.
Get some trail maps of the mountains, and create your own route!