If you are fit, the Flume Trail absolutely rocks. The initial climb up to the rim will be hard if you are not used to riding long hills. We do the flume as a circuit-instead of going down the standard way, turn up hill through Red House and Marlet Lake. It's incredible, and worth the pain to get up the hill.
Other than the fitness needed, the trial is not technical. It has some of the best scenery in cycling.
1997 FZJ80 Desert traveller
1989 FJ62-OME, 33s, OME suspension, H55f
1984 FJ60-SOA, H41, toybox, locked, 37s, Rubicon edition
1971 FJ40-SOA, FJ60 axles, 85 2F, it abides