I don't know about where you're at, but around here the trout eat bugs. That means we have clouds of mosquitos whenever we'd be trout fishing...Of course, anything can be overcome with proper planning.
I honestly haven't done much fishing in the last few years due to having two jobs in the summer. I'm hoping to take a fly fishing class next year. I know of a stream that has Rainbows, Dollies and all 5 kinds of Pacific salmon. Ooh, man, that place is just dying for a fly rod.