We got up before dawn one morning and took a ride into Lamar Valley. It was a bit nerve-wracking beating the sun after hearing people say not to drive in the dark in the park. We did have to stop suddenly for a deer at one point. Saw plenty of buffalo and elk. Found a group of people with expensive cameras at one of the main pullouts. We stopped and found they were watching two wolves up on a ridge. You could just barely see their ears but once in awhile they'd sit up or walk around. At one point, they both howled for a bit. On the way out, we spotted some bald eagles and an osprey nest with three babies in it. Definitely a highlight of our trip.
We had some binoculars from home, but also rented a scope with tripod for $20/day at a store in Gardiner. We were glad we did for the stability and clarity.