If the weather is decent fishing The Miracle Mile or Grey Reef are worth giving a shot. Frontier Canyon is a sight worth seeing also. I spent 3 days fishing these areas on the North Platte in 2021 before an archery antelope hunt. Beautiful river and there weren't a lot of fishermen. Only 1 other guy in Fremont Canyon. There are quite a few public access places or you can hire a guide at one of the many fly shops.