Tentative date:
Whitewater rafting and quarts crystal digging. There is about a 3 hours drive from the crystal park to the nearest whitewater rafting. There are a lot of options for other activities like horseback riding, hiking, hot spring.
Here are a few links to copy and paste:
https://www.montanawhitewater.com/wp-content/uploads/2024/02/2024-Brochure.pdf
https://www.raftmontana.com/full-day-gallatin-rafting-trip-big-sky-montana—best-value.html
https://www.fs.usda.gov/Internet/FSE_DOCUMENTS/fseprd1088683.pdf
https://www.fs.usda.gov/recarea/bdnf/recreation/rocks-minerals/recarea/?recid=5669&actid=73