You mostly just have to talk to/hang around Veronica a lot and she might tell you where the BoS Bunker is... if that's what you're looking for in the Hidden Valley. EDIT: Oh XD Nevermind.
As for Deathclaws, I just find a spot and snipe them. If they see me, time to pack up and run.
Also, I've been testing out the very awesome
Unlimited Companions mod, I've recruited BOTH Boone and Veronica WHILE ED-E is following. Seeing a long line of party members sneaking behind me while inside a dungeon or something is hilarious.