Nice article in this edition if National Geographic Adventure magazine regarding the 50 Best American Adventures. 5 of the 50 adventures are bike rides.
 
#1-Biking the Continental Divide(most of the ride is on doubletrack forest roads, with some smattering of asphalt). Oh,there's 200,000 feet of climbing(7 Mt Everest's).  
#7-Biking RAGBRAI-Momma Loon will be looking for you John S.  10,000 riders,25,000 ft of climbing.
#16-Mountain biking Durango to Moab. Weeklong mountain bike  expedition. 215 miles
#29-Bike the Death Ride(California), 129 miles,15,000 feet of climbing. Most demanding road race.
#39-Bike the Maak Daah Hey(North Dakota), 96 ,soon to be 176 miles of singletrack in the Badlands.
 

Quote from aikigreg on Apr 16^th, 2009, 3:26pm:

 
Let me guess ,there was Alcohol involved...  
 
Now how about a Continental Divide trip? Are you in?  
 

Quote from catroad254 on Apr 16^th, 2009, 6:25pm:

 
JS, sounds like a new proto-type...