Tour through a wondrous half-mile of stalactites and stalagmites in the largest limestone cave in Idaho. The US Forest Service offers a tour through a wondrous half-mile of stalactites and stalagmites from Memorial Day (weather permitting) through Labor Day. This is the largest developed limestone cave in Idaho. The site tour does include climbing stairs. This tour is not advisable for people with heart or respiratory conditions. Sweaters and shoes with a good tread are advised. Maximum per group is 30. Arrive early in the day. Attention! If you plan on visiting Minnetonka Cave please DO NOT wear any clothing (including shoes, hats, belts, jewelry) or bring any items with you (such as cameras, backpacks, cell phones, purses, etc) that have been in another cave or mine.