South Dakota - Running the Black Hills ultramarathon and exploring Devils Tower and the Homestake Mine make for an excellent ultrarunning destination weekend.
All in Races
The Rock 'n' Roll Nashville Marathon, a race worth repeating - Nashville, Tennessee
Tennessee - Nashville, Tennessee is a great destination for their well run road Marathon, or for trails conveniently located near the city center.
An ultramarathon experience in the Australian Grand Canyon - Blue Mountains (New South Wales), Australia
Australia - 70k of trails in and out of the Blue Mountains, just a 2 hour drive west of Sydney