This recreation area is part of Lake Bryan

Boyer Park & Marina KOA

This a a great site with all the amenities. It provides a boat launch and nice sized RV lotes. It is kid friendly and is a 2 minute drive from Lower Granite Dam if you want to take a tour. It is also a 10 minute drive from Illia Dunes for a day trip.

Snake River Beauty

Only downside is no Verizon coverage and free wifi is junk. But for $3/day you can get decent wifi. 
Quiet during the weekdays. Gets REALLY busy on weekends. A lot of families with a lot of kids. If you are a curmudgeon you won’t like it on the weekend. We were entertained. 
Sites are moderately sized. Huge compared to most KOAs. 
Grass is immaculate and so is swimming beach. Nice paved trail along river. 

Beautiful, clean, good amenities 

Super safe and well organized. A little pricey and you need a reservation. Usually packed. Great for families (large and small),  boaters, fishers, and the casual glamper needing a break. Bathrooms and showers were clean and accessible. Very developed campground, so not very outdoorsy. If you need a break from people this may not be for you 