Hi Eileen,
I did a 6 hour adventure race last year. It was not Genesis, but one of the GOALS races. It was tons of fun. I was on a three person co-ed team with my husband and another friend of ours. We were already mt biking pretty hard, but we trained the other sports for about 4 months before the race.
Now, I do have to tell you, that although it was a blast, it was HARD. And hard in a different way than a regular triathlon or mt bike race, because there is the mental aspect, and that is the finally sport involved.
We did not know the order of the events until after the first "task", and now you have navigation on top of everything else. Cool heads prevail in this type of race.
If you can get a well rounded team together, you will love it. It is very different.
Feel free to pm me if you want more info, or I will check back on the thread later.
Ruth