I don't know of any water in your area but here's a few tips on maneuvering:
For the most part, look for and stay in the main flow of the water. Sometimes it can be a narrow strip in between back eddies.
Use back eddies to your advantage. Use them to stop you, and actually to float 'up' stream. Also use them to get to and anchor to shore. Don't try and anchor to the bank in fast water. When leaving a back eddy and, getting back into a sometimes fast current, merge into it like getting onto a freeway. Rowing into it at 90 degrees causes the boat to lean down on the up stream side and could be unsafe especially in a drift boat.
Usually, a 'V' or 'tongue' shape on the water will be apparent at the top of a set of riffles or rapids. Go straight through this and maintain your position as this is the main current and will send you down quickly without much unstable water pushing you around.
When the river makes a turn close to shore next to trees or rip rap, do not go straight down otherwise you could get raked by branches or scrape your boat on the rocks. Instead, go through it sideways with your back towards the middle of the river then row away from shore as much as needed to avoid the rocks or over hanging trees.
Positioning yourself on the water to avoid obstacles, getting to back eddies, or entering rapids is done by swinging the boat left or right and rowing across the water then straightening out. This should become second nature like changing lanes while driving. You will be doing this the most during your float.
Sorry if I'm over simplifying or telling you stuff you already know, but I thought I would share some of the basics in case you didn't. Oh yeah..use a PFD.
Jim