Just drive up Lamoille Canyon and look any direction and go! Yes, they did get some snow, but not enough yet to be a show-stopper, but also not enough where an ice axe will do you any good either. Some cramp ons or traction MAY be in order though, but probably just some good boots and gaiters. The hike to Liberty, and Farve Lakes and over Liberty Pass is nice. The road leading to the end of Lamoille Canyon was still open last time I was there a couple weeks ago, but that could have changed with the last small storm that came through. Have fun!
Castle Peak is really easy to access off I-80, and would be a very simple peak bag without too much diversion from your route. It is access near Donner Summit on your way to Cali. once you pass Truckee. Look for the PCT signage, pretty easy to find.