This is a lovely hike! We did it in late-July and there were still loads of wildflowers blooming. There are many birds by the river, offering great birding opportunities. The trail is easy, with just some rolling steeps at the beginning; well maintained! I'd suggest leaving to hike early in the morning during the summer months as it can get hot in the alpine sun.
The drive in is long and bumpy requiring a medium, to high-clearance vehicle due to large rocks embedded in the road. There are numerous beautiful camping spots on the way in, no need to pay at the early campgrounds.
From the main trail you can access numerous big mountain ascents, so plan to backpack in and day pack up!