We won't take care of nature if we don't experience it or know anything about it. You get bonus points if you use native plants and species that require little water, plants like ilima, a'ali'i and wiliwili. It will help minimize the spread of non-native noxious weeds and the need for accompanying herbicides to battle them. Practice safe hiking and traveling. Seeds and spores from non-native, noxious weeds can be easily spread to new areas where they grow wildly, overtaking and choking out native plants.
Many weeds occur only on a single island.
Watch the whales from the shore. This one may sound extreme, but these big guys need a lot of space. However, we strongly encourage benign whale watching, and this is the most benign possible. Volunteer for a work party in the field, trail building, maintenance, weed pulling. This one's a no-brainer, but we had to.