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Callospermophilus lateralis
Small squirrel (chipmunk-esque, but a little bigger) seen climbing on rocks and checking out hikers. Clearly not disturbed by the presence of people, as seen in the third photo (*yawn* "oh, you're still here?")
Climbing on rocks on the far side of Jenny Lake in Grand Teton National Park, WY.
Yes, this is a Golden-mantled Ground Squirrel; the combination of large size, creamy white sides, lack of facial stripes and bright orange-red mantle are what distinguish it as this species as opposed to a smaller chipmunk.