This is is the Groover and its compatriots. Since some 26,000 people may venture down the river corridor every year, you have to take your solid waste out with you. The white bucket has the more liquidy waste (if you can't make it to the river). The rusty can is the "key" to the bathroom and contains the toilet paper. If you don't see the key, it's occupied! It all seems pretty unpleasant until you actually go on the trip. The smell isn't that bad, especially not when you keep adding more Clorox powder. "Powder the doughnut" as the guides say... Note the little purple flower on the pee bucket. It's all the about the composition of the photo, right?
Vulcan's Anvil. This is an old volcanic neck in the middle of the river that is considered sacred by some of the tribes that live in and around Grand Canyon. This means the boatmen no longer have virgins kiss the rock for luck right before heading into Lava Falls rapid. Why yes, Lava IS one of the bigger rapids on the river...