Try the baked Manapua from Royal Kitchen and different fruits from the stalls/vendors.
$30 for Docent led tour or $25 for self guided tour! Try Julia’s Cafe @ YWCA after tour and take pictures near Kamehameha Statue
Great cliff jumping spot on North Shore
One of our favorite sunset spots on the island. Please practice extreme caution of you decide to jump and listen to the locals if they say tide conditions are unsafe!
You will be right under the Ko'olau mountain range. There are a couple paths that you can walk around and see other plants or lakes. Military free, civilians $5 (I think)
One of the best places to snorkel on island. It is $20 per person to get down there though and is hard to get a spot. Other great snorkeling options are Electric Beach (west side), Secret Beach (if staying on base).