Kanab Tour Company is one of the best in the area, with tours to the North Rim of the Grand Canyon, The Wave, White Pocket, Peekaboo Slot Canyon, the Great Chamber, and SO many more places. They took me to White Pocket for the first time and can't sing their praises enough. Seriously though, they can get you just about anywhere in this area, whether by ATV or vehicle.
Want to save 20% off your tour? Ask to book with SHELLY. To receive the discount, you MUST call the main number, mention Shelly, and book with Shelly -- 435-500-5008. Mention Mallory sent you :) (I don't make an affiliate earning, just love Shelly and the company)
Again, you cannot book online to receive 20% off -- call the number above, mention and ask for Shelly.