This will be a self guided trip. You Park at the Trail of Two Forest, which requires a NW forest pass. They have machine in parking lot. Also maybe available at Cougar store. The cave is about 10 min. walk past the outhouse. The is almost all walking, with a ladder climb down and another easy climb down. There will be lots of breakdown for awhile. keep an eye out alone wall for melt features and further down for a side erosional passage. The lake usually dries up in summer. Also near the entrance check out the side red passage.
Check out video link under website link.