In park: If you arrive late morning or early afternoon, the line for the bus ride could take a while by itself. But, if you're going early enough in the morning to manage it, take the bus out to the Riverwalk area at the end and try to squeeze in a quick hike out towards the entrance to the Narrows. I'd even suggest walking a short way into the canyon itself (bring shoes you can get wet). It's absolutely beautiful but gets extremely crowded as the day wears on. It's even a relatively flat and easy trip and only about a mile. The actual trail is even "paved" up to the entrance area for the Narrows, and the walls are weepy with the water seeping out in places, creating a lush little ecosystem along the way. Walk along the river itself for the trip back to the bus. It's less crowded and gives more variety. If you can, enter or exit on the east side. It's a steep, winding drive, but you'll pass through the tunnel, by the Great Arch, and by the Checkerboard Mesa.
I'd suggest also taking the bus to the top.
The car ride takes one our tops, even if you don't get out. The pull over locations are spread out all along the road so you can make quick scenic stops. I went with 4 kids under seven, two dogs, and we all had a blast.
Drive around and do an easy hike by the visitorS center then drive towards Bryce canyon to see different views
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