Here are the results I received from rides I am considering doing.  
Several people asked me to give them the results.
Quicksilver, San Jose, Oct 12
*  Moderate difficulty, nice wide fireroads, lots of access, good 
footing.
*  Good finishing prizes.
*  Good ride management.
*  Base camp in one spot, no moving.
*  No streams but watering troughs in 4 locations.
*  Large staging area with plenty of room to turn around in.
Lake Sonoma, Near Geyserville Oct 26th
*  Single track trail, difficult to pass.
*  100 to 200 foot drops into the lake.
*  Trail twists and turns, up and down, difficult to keep a steady pace 
at any gait.
*  Staging is on a very hard flat parking area, not a lot of room.
*  Fantastic scenery
*  Lots of ticks.
*  Moderate in difficulty.
*  Have to trailer horse back to camp from finish line.
*  Good ride management
*  Some people ride in Halloween costumes.
*  Campground has good facility but you're parked in a graveled parking 
lot.
Gold Country, Georgetown, CA  Sept 28th
*  Weather conditions can turn ugly.
*  Campground... beautiful with lots of shade.  Can fill up fast.
*  Tough ride, lots of steep climbing.
*  Some of the same trails shared with off road motorcycles.
*  Vetting was slow in 93', improved in 94'
*  Ride management gets your lunch to the stop and provides hay, water 
and bran mashes for your horse.
  That is all I received.  It is interesting how different people's 
experiences and perceptions are of the same ride!  I guess your luck 
can go either way and this helps give an overall impression of the 
ride.
  Thanks for all the input.  Happy riding.
Kimberly (&Mystery the Morab)
Petaluma, CA