Main point of this trip report is to mention that there is a well-defined easy trail leading up from southwest of Amphitheater Mountain all the way to the west peak of the mountain, and from there one can easily stroll off-trail along the ridge over to the north and south peaks. I haven't seen this trail on any maps and is only briefly mentioned in WTA's description of the Boundary Trail, but I highly recommend if you are in the area and have time for it.
Starting from the Cathedral Driveway Trail, I took the Chewuch River Trail and Lesamiz Trail over to the basin southwest of Amphitheater and set up camp at a tarn.
On the following day I followed the trail to Upper Cathedral Lake and scrambled up Cathedral Peak. There is no snow remaining in the summit chasm. For the second chasm crossing, the standard step-across or jump-across move looked well beyond my risk tolerance. So I chose to walk across the chockstone just to the right and slightly lower, seeming a much more controlled option (though also exposed).
After Cathedral, I followed the trail over Cathedral Pass and then off-trail up the south ridge of The Pope (peak just northwest of Cathedral). Some class 3 moves. Nice view north from the summit.
For Amphitheater, I started at the base southwest of the west peak and headed directly up (class 3), then walked along the gentle ridge to the north peak and to the south peak, and dropped down west-northwest from the south peak (class 2). Though my ascent and descent were off-trail, as mentioned before there is an established trail to the west peak.
On the third day, I hiked back out to the Cathedral Driveway Trailhead (AKA Chewuch Trailhead).
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