inthedirtagain said it right wih 'Hell's Revenge' and 'Slickrock Bike Trail' are a MUST! you can do 'Fins and Things' as well as these 3 trails are all very close and should take 2 - 3 hours to ride all of them. (Note you will need to pay a fee to get into Sand Flats Rec Area). as for 'Pritchet Canyon' it is one of the most difficult trails in Moab and unless you are very good at handling your big 650 I would steer away from it. A good trail to try before Poison Spyder Mesa is '7 Mile Rim', it is on the lower difficulty rating and will give you a good warm up before Poison Spyder. 'Behind The Rocks' is a fun area with a bit of everything. I did 'Kane Creek' Last Fall and it was a fun ride, lots of water and sand (you will get wet as you cross the stream over 50 times!).
The biggest thing is get a Book/map and know how to work your GPS! I find most of the trails difficult to follow and you can easily get off the trail and end up going down some side trail that is not on the map or marked.
Have a good time Moab is like no other place you have ever ridden. I will be there May 2012 (my 5th trip in 2 years).
Edited by kowski13, 09 April 2012 - 11:44 AM.