New York City
Can anyone recommend good places for swimming around: Boise, ID, Jackson, WY and/or Yellowstone National Park, or Cody, WY?
There are two great places to go swimming in Yellowstone National Park: 1 at the Boiling River Springs near the north entrance and 2. at the Firehole River. The waters at Boiling River springs is extremely hot so be careful not to get scalded. It's got a unique spot in the river where the hot spring water meets the cold river water and you can have one butt cheek in the hot and one in the cold side at the same time!
You can try the Aquatic Center in Jackson through the Trenton Parks & Recreation center. Here’s the link for schedules: http://www.tetonparksandrec.org/recreation-center/aquatic-center/pool-schedule