The Belknap guide to the Canyonlands is a waterproof book with large scale maps that will help you keep track of where you are, and the miles you travel each day.
Your outfitter will probably put you in at Crystal Geyser, five miles below the town of Green River, and before you know it, you will be running into sandstone scenery like this.
You will want to make this trip last ten days to really get relaxed, so when you start out you will be carrying lots of water in the bottom of your canoes. Food and camping gear should be in waterproof containers in case you have a spill, but that hasn't happened in our group in two separate trips. There are only a few places on the entire trip where you will see a riffle in the water.
You should plan each day on the river so you begin and end early. It is common for winds to kick up in the desert in the middle of the day, and the wind can make paddling difficult. A few of the camping spots are difficult to tie up and unload in, so it is best to arrive early and have plenty of time to set up for the evening.
He has turned out to be a real travelin' man.
After your week or two floating down the Green River, your outfitter will meet you at the confluence and jet-boat you back to Moab on the Colorado. We have used Tex's Riverways to put us in and bring us back two times, and have had very good service. There are other outfitters in Moab, and I am sure if you do an internet search you can find them. Tex's website has lots of information to help you plan your trip, and you should start planning now if you want to go this summer.