I would say with water temp cooling down, fish get a little more bold. Technically insect levels should be slowing down if not at a grinding halt. If your going to use bait I would suggest minnow or leech imitations with water temp cooling Fish are likely to be up cruising the shallower water. Trout are magnets to wood, whether it be a beaver house or a dead head, (ideally the fresher the wood the more likely it will attract fish, small organisms will surrond new falls which attract baitfish, you get the ideal), If you going to be float tubing it you butts on the water it will be difficult to see whats going on around you, so light line and long cast will be you friend i suggest a 4 to 6lb flouro carbon, has less strech in cooler water and less likely to spook fish. You could also try the bubble technique, getting a casting clear bubble and putting a fly on behind it, if so good patterns in the fall are any colour woolybugger or immitation blacknose dace. But don't limit yourself trout depending on the species may not be alone.
