Flies: The traditional advice is to use black in turbid water and light colors in clear water, but I've always had better results with darker flies--black, green, and brown. Woolly Buggers and Zonkers are effective, as are steelhead patterns. Use the largest fly you can handle on a light tippet.
Tackle:** A 9-foot, 5- to 6-weight rod like the G. Loomis GL3 works well. Load it with a weight-forward floating line such as Scientific Anglers Mastery Series GPX. Because you have the chance to hook up with a big trout, don't go with a cheap reel with an indifferent drag. Try L.L. Bean's Mid-Arbor reel, which features a smooth center disc drag that helps protect light tippets. Tippet choice is crucial here; Rio Powerflex is excellent.