I've been coming to Lake Hemet for several years. The campground is clean and the fishing is good, most of the time. They stock the lake regularly so you have a good chance of catching trout, even from the shore.

It can get a little loud on the weekends with drunk party-goers. There's not a lot of campground etiquette either. Not the campgrounds fault. Just uncaring people stomping through your site on their way to and from where ever.

There's a water park for playing in the lake but, the lake is off limits to pets. If you forget something there's a store at the entrance. You can even get a fishing license there if needed. 

The staff are friendly and helpful most of the time. But, like anywhere people get out of hand they can get surly too. 

A lot of sites have some shade but you have to look for them. Full hookups are available too.