Before the 2.0 update to Animal Crossing: New Horizons, the best way to get around to higher cliffs in the early game was getting a ladder. The ladder is a tool you can craft and equip to climb up and ...
In Animal Crossing: New Horizons, you can use a ladder to climb cliffs. When you are against the cliff, hold the ladder, place it next to the cliff face, and then you can climb it to reach the top.