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This is something of a local tradition, with the floating season starting in the summer dependent on river conditions. The put-in site is at Barber Park. Floaters may bring their own tubes or rafts, or rent them at the put-in site. The 5 mi float takes around three hours, and ends at Ann Morrison Park. There you can take a shuttle bus back to your car at Barber Park.
If you are bold, you can ring the bell at the foot of the Capitol steps. The Capitol underwent extensive renovation and in early 2010 reopened amidst much fanfare after being completely closed (including to government officials) for the better part of two years. Guided tours are by reservation only, but there is an exhibit about Idaho and its government on the ground floor. All exhibits and floors, except for government offices and the legislative chambers during government sessions, are free and open to the public.
The Boise area is home to one of the largest concentrations of Basque populations in the world outside of the Basque Country. The museum, in a part of downtown known as the "Basque Block," is a great place to visit whether or not you are of the Basque descent. Chock full of enriched heritage and even a bar to hang out at. A must see if you are in the Boise area.
This Olmsted-esque urban park contains many of the downtown attractions in Boise. It sits across the Boise River from Boise State University. Located within its confines are Zoo Boise, the Rose Garden, Boise Art Museum, a scenic railroad, and the Idaho Black History Museum.
A great contemporary art at a very reasonable price. This museum is planned out beautifully and much more than most would expect from a town the size of Boise. Great local pieces as well as other western art. Free and open later on the first Thursdays of the month.
History of Idaho from prehistoric days to now. Includes exhibits on Native Americans, Basques, pioneers, and Chinese history. Due to renovations, a small temporary exhibit is at 214 Broadway Ave and open M-F 11AM-4PM.
An interactive science museum that offers educational programs sensory exhibits designed to make the sciences, technology, and math tangible.