The Expedition Everest Challenge is open for registration. This race is a bit quirkier than the others in that:
A. You run at night instead of early in the morning.
B. It includes a few obstacles. (But you can walk around them if need be.)
C. You do a scavenger hunt right after and depending on how good you are / or how determined you are not to ask the volunteers for help, might just walk as much or more than you did in the 5K.
But the compass finisher medal is way cool. Lots of friends and families with older elementary / middle school kids do this one. You can complete the challenge as a two-person team, family, or individual. Definitely not a boring 5K!