When Dave and the boys go to a national park for their camping trip, they accidentally camp under a waterfall, convincing Dave it's raining. They move the tent (which happens to be over a geyser). When it erupts, Dave blames Alvin. Later, when a bear takes Alvin's cap, Dave thinks the bear ate Alvin (who's out digging gold) and runs to the police. The man tells Dave there's a bandit out in the woods, quickening Dave's resolve to find Alvin. Alvin and the bear find the loot and capture the bandit. Afterward, the park ranger takes Dave away since he thinks Dave's crazy.