You can do as much or as little as you want! Beaches, diving (best reef in Hawaii!), snorkeling, whale watching, fishing, hiking, take the mule ride or fly in for the Kalaupapa tour (don't miss it!)--sadly this is currently closed due to COVID. Take a guided hike to Halawa falls--great learning experience! Late night hot bread from the bakery, Saturday market, canoe races, hula, sugar mill, coffee plantation, Kumu farms, Purdy's macadamia nut farm (crack a few open and try some, and learn how they are grown/roasted), and so much more to explore!