Whilst we were in the Mt St Helens neighborhood we did a few hikes and stuff...
Went ape in a cave
"Ape caves" are lava tubes, the longest continuous tubes in the contiguous US in fact, there's the easy half and the rough half... I opted for the rough half. You get to climb piles of boulders/slabs that fell off the ceiling. (Only left a little bit of my right shin hide behind).
2.5 miles long and about 2000 years old.
Saw a 1972 Pontiac that was 8.5 miles from the eruption- 300 MPH wind and debris made this one a challenge to buff out.