If you are dropped off either at the front or at the stop for Riva, the walk should be less than five minutes. The theatre is at a mid point.
It's not far at all!! I remember having to climb a set of stairs that were a bit south of the drop point.
If the Uber drop off point is anywhere near one of the Pier's parking garage entrances, once you're inside the walk is quite doable. However, if you're physically challenged, I suggest that you call the pier and find out if there's any kind of assistance that can be provided.
It's a good long block from the theater to the Uber pickup, but a driver may be able to drop you closer
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