What do the boys want to do when Ralph says that they have to keep searching?

In chapter 6 of Lord of the Flies, Samneric have had a right old scare. They've seen the parachutist's dead body dangling down from the trees and mistake it for the Beast they think has been stalking the island. The two petrified little boys run back to camp, where they tell the others what's happened. Ralph and Jack put an expedition together to go look for the Beast, with only Piggy and the littluns left behind at camp.
The expedition reaches a steep hill pockmarked with little caves. Though initially rather frightened and hesitant, Ralph soon plucks up the courage to venture into the caves in search of the mythical creature. As is often the case, however, the other boys in the group are less than helpful. Instead of exploring the caves with Ralph, they prefer to mess around, playing games and throwing rocks into the sea. They're treating the whole expedition as if it were nothing more than a giant lark.