Most of our plans have some variation of 3 stages: Vehicle, bike (or canoe or...), and foot (or expedient swimming). Think powered vehicle, human-powered vehicle, self-propelled. The first stage transports the second two stages "just in case", the second stage transports the third stage "just in case", and if the third stage does not get the job done, S.T.O.P. - actually, various plans/scenarios discussed en famile have temporary rally / bug-in locations as well.