The Whistler 50 Ultra is a popular ultra/relay event known for its scenic course and kick ass afterparty. The race takes runners through the valley trail system around Whistler village, completeing multiple loops for a 50 mile (80k) total distance. This popular ultra replaced the Haney-to-Harrison 100k relay in 2011 and has been a staple event in the fall ever since.
The majority of racers run this event in a relay team (they offer options of two, four, or eight people), or, it you like the idea of running 80 kilometers yourself you can elect to take on the course solo.
The Whislter 50 course is mainly on the Valley Trail system which means mostly hard packed gravel or paved trail. The course itself is a 20km loops which ends up being completed four times over the course of the day.
For solo runners things are pretty straightforward, run loops until they tell you to stop. Teams of two end up running alternating loops, teams of four do one loop each, and teams of eight run alternating legs of 13km and 7km.
There's no traffic on the course, and the relay exchnage points are in the village and very close to each other making this an incredibly spectator friendly event. Hills are not a major factor, there are some undulations but nothing to be concerned about.