When in Batanes, a daytrip to Sabtang Island should be part of your itinerary. You'll see the locals, trees, villages, houses, animals, food, beach, lighthouses, cliffs, views (even fortresses) and many more! It's very accessible by boat then rented jeep from Batan Island (where Basco is). Check out Part 1 on how to go to Sabtang from Batan or Basco and some things to remember. Part 2 is about what else you must not miss which are two of my favorite parts of the trip - the palm trees and the village of Chavayan! We didn't stay there long but I loved every moment of it while I saw the trees all throughout the island =)
