What escape plan will Huck and Jim enact if people look for them on the island?

Jim said if we had the canoe hid in a good place, and had all the traps in the cavern, we could rush there if anybody was to come to the island, and they would never find us without dogs. And, besides, he said them little birds had said it was going to rain, and did I want the things to get wet? Ch 9