Park at the Samoa beach access parking lot, and follow the trail northeast from there to the listed location. There you'll be at one end of a structure that Hidegoseek and I found while scouting locations for Sub Hunt. We were surprised to see it, since we'd both been past there many times without noticing it. I wonder if that's true of other people, so in your log please answer the question in the cache's name. (Or don't; there's no penalty for not answering.)
The coordinates for stage 2 are N 40° 49.AB8 W 124° 11.BC8, where A, B, and C are the answers to these questions:
A: How many metal posts stick up from the concrete at the opposite end (the southeast end) of the structure? (NOTE: As of 5/30/2023, you'll have to add 1 to the number, because 1 post has been removed. But I'm archiving the cache, so probably very few people will care about this.)
B: The "Samoa Booster Station" is a short distance northwest of the structure. A sign on the nearest side includes a phone number. What digit occurs most often in that number?
C: What's the last digit of the phone number?
There's no container at stage 2, just the coordinates for stage 3.
WARNING: As of 5/20/2020, part of the information at stage 2 is missing. It's unlikely that I'll replace it during the pandemic, so here's the missing part: ".257". Thanks to wesser26 for reporting this.
Stage 3 is a SnapWare container, about 2 by 4 by 6 inches, painted tan.
Congratulations to AlpineOwlet for FTF!