I've fished Bennett on the weekdays. It is said to be signficantly less crowded although you won't have seclusion at any time.
I think they have a kids fishing scheduled in the next week or two. Might be worth calling about. They set off a stretch of stream for kids--adults can only help and there's hot dog roast involved.
To get into fish, I'd recommend either just above the dam fishing right toward it, or the hatchery outlet. Fish glo-bugs under an indicator---4-5 ft. deep. They stock a lot of fish in those areas and glo-bugs work well, especially the "tri-color" ones yopu can get at the park store.
Here's a good website: Weaver's Tackle Store
They have a twice weekly fishing report. The general word coming out of Bennett is that the fish have been deep because of heavy rain though that may be changing now that the water is clearing.