One armed John Wesley Powell was the first white man to navigate the Green River in Utah in 1869. He didn't see any more people on that trip than I and my then 8 year old son did on our four day, three night paddle. The Green River flows south, the Colorado River flows south west, intersecting approximately 45 miles south west of Moab, UT. We were transported, along with our rented canoes, to our put-in on the Green 55 miles above the confluence in August. Depending the time of year and associated water flow, i.e., spring run-off produces large, fast water, while in August, slow flow, and the amount of side canyon exploring one chooses to do, your trip can be any duration over two days. No rapids exist, however, with big water, currents can be tricky. Basically, no experience in canoeing is needed during low water. You set the date you want to be picked-up at the confluence of the two rivers and transported up the Colorado River via jet boat to Moab. All outfitting, transportation and advice can be accommodated through Tex's Riverways in Moab. It's all down hill.