The trees are spread out across a huge area. I've been a few times, but couldn't begin to suggest a specific tree or spot to shoot.
I suggest you arrive early. Set up your camp at Grandview, then head out to scout possible sunset / sunrise sites. Bring a compass so you can set up a given shot knowing where the sun will be. (See http://www.timeanddate.com/worldclock/astronomy.html?n=390&month=7&year=2011&obj=sun&afl=-12&day=1
) By the time you work your way to the end of the road, it will be getting somewhat late and you'll have to decide where to go.
Next morning, up before dawn (You're a photographer, right?
) for the good light.
Afterward, you might try descending to Bishop via Silver Canyon. It's a pretty drive, if somewhat rough. You won't need 4WD, just high clearance.