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Kanarra Falls in Kanarraville Canyon is one of the most-easily-accessible and dramatic slot canyons in the world. Unfortunately, this has also led it to become so popular in the past ten years that there are now fees, limited permits/tickets, and other regulations. For example, street parking in much of town is not allowed and you will be ticketed.
Further information and tickets available here: https://www.kanarrafalls.com/
That said, it's worth your while and you will never forget it!
You'll walk for a while and cross the stream before you reach the slot canyon itself, and there are a few spots where you must climb sloped ladders to continue.