Platte river, c470 down through Union Chutes should be right next to you. Unfortunately, flows aren't really great right now
. IIRC, 700 was a nice flow for the Union Chutes section.
I recommend the two books mentioned above, as well.
Once you've got your roll dialed in, you might be able to squeeze an evening run on Waterton. Have someone show you down; run the left-sneak at Greenbridge Rapid. Minimum flows are 300, for the hardshell. Not a beginner run, more like 3+. At 1000, it's pushy but very easy; greenbridge is completely under water and can be run smoothly down the center. Run Avalanche (marked by an A shaped rock) on the left. Entrance Exam is just that, the first rapid of Waterton and kind of technical, depending on flows.
It can be run below 300 but with the hike out and all that, it tends not to be worth all the scraping and such.
Anywho, a good easy run once you've come along a ways; can be run early winter, flow-depending (drysuit and pogies/toaster-mitts a must; rolling best kept to a minimum; take the creek boat).