Pumphouse for sure. Big Horn Sheep canyon on the ark is fun, but not wilderness. Fishing should be great on both runs. Pumphouse offers better scenery. The run is more secluded wilderness, and the couple little canyons are awsome. So is big horn, and you can see 14'ers from that run. but if it were me, i would do the pumphouse.
If you run the Ark with a child who's never rafted before, you may want to either run from Johnson Village (launch at Wilderness Aware for $3) to Ruby Mt. (The Milk Run, all Class II) or from Stone Bridge to Salida or Big Bend (Class II w/ one easy Class III). These are a couple of the tamer reaches above Salida.
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