According to forum posts, Idaho offers several scenic drives and natural attractions that are must-visits. Travelers have recommended driving through Idaho State Route 21 between Idaho City and Stanley for less crowded, picturesque routes. The drive from Boise to Sun Valley is also noted for its beauty.

Some travelers mentioned the Old Idaho Penitentiary and the World Centre for Birds of Prey in Boise as interesting historic and cultural sites. Additionally, the Cataldo Mission near Coeur d'Alene, Idaho’s oldest building, is a recommended visit for those interested in history.

For outdoor enthusiasts, forum users have suggested destinations like Coeur d'Alene and Sandpoint for their beautiful lakes and potential for activities like hiking and boating. The Sun Valley area is another highlight, offering activities ranging from horseback riding to fishing, and is a base for exploring the Sawtooth National Recreation Area and Craters of the Moon National Monument.

Lake Coeur d'Alene is frequently mentioned for its cruise tours and public beaches, providing a relaxing environment and water activities. Similarly, the town of McCall and Payette Lake are praised for their idyllic settings and opportunities for water sports.

According to forum posts, there are several scenic routes starting from Boise, Idaho. One recommended route is driving Highway 55, which provides a picturesque journey through Idaho's landscapes. Another suggestion is taking Highway 21 to Lowman and then Highway 24 to Banks before joining Highway 55 to McCall, although this is noted to be less scenic than the direct Highway 55 route.

Travelers have called out the drive from Boise north on Highway 55, then east on Highway 12 through the Nez Perce Forest as a particularly scenic option. This route offers a mix of forested landscapes and opportunities to explore small towns.

Some users suggest the Sun Valley Loop for its beauty. The drive involves taking Highway 75 to Sun Valley and then continuing to Stanley, with the option to return to Boise via Highway 21. This area is highlighted for its stunning mountain views and natural beauty.

Some travelers recommended the Sawtooth area for its stunning hikes and lakes. According to forum posts, popular hikes include the Alice Lake loop, Farley to Imogene, and the Sawtooth Lake trail, which is noted as the most photographed lake in the region. Another scenic option is the hike to Goat Lake, described as beautiful with steep sides and a very blue lake, although access can be challenging.

For those interested in water-based activities, the Middle Fork of the Salmon River offers some of the best whitewater rafting experiences in the U.S., with options suitable for Class 2 or 3 rapids. Travelers have highlighted this as a top activity in the Stanley area, which is part of the greater Sawtooth region.

In addition to hiking and rafting, the Sawtooth area provides opportunities for wildlife viewing and other outdoor pursuits. Travelers have called out mountain biking and kayaking as enjoyable activities in this scenic Idaho wilderness.