TASK DEFINITION: Two analogies that relate places/locations to the associated travel mode is given in the form "A : B. C : ?". "A : B" relates place A to travel mode B. Your task is to replace the question mark (?) with the appropriate travel mode for the given place C, following the "A : B" relation.
PROBLEM: hospital : ambulance. island : ?

SOLUTION: boat

PROBLEM: mainland : boat. restaurant : ?

SOLUTION: taxi

PROBLEM: park : bicycle. mars : ?

SOLUTION:
spaceship