When the Rocky Mountains begin to melt in the spring, whitewater paddlers rejoice. Clear Creek in Golden not only features some of the craziest, best paddling in Colorado, there's also a whitewater park right in downtown Golden. South Boulder Creek in Boulder is more gnarly but skilled paddlers can work around the rocks for some spectacular lines. Boulder also has a modest whitewater park right in town at Settler's Park. Denver's own South Platte River is relatively calm through town but during high runoff periods, can provide a local thrill. The South Platte is more engaging around Bailey (about 45 minutes from Denver) where paddlers can find a mix of fast moving water and calm stretches of scenic forests.