Antonyms for the phrase "take a boat" could include "drive a car," "ride a bike," or "walk on foot." Depending on the context, other antonyms might be "fly a plane," "ride a train," or "hitch a ride." These antonyms are all ways of traveling that do not involve taking a boat, whether on water or land. The choice of transportation often depends on factors such as distance, time, cost, and personal preference. Nevertheless, it is important to choose the safest and most efficient mode of transportation when embarking on a journey, whether it involves taking a boat or not.