A few recommended golf courses in the area: 15 minute drive: Kona Country Club 45 minute drive: Mauna Kea Golf Course, Hapuna Golf Course, South Course at Mauna Lani Resort
Many companies sponsor tours, below is a link to one in the area.
Just one suggestion below. There are plenty of options for hiking from lava, waterfall, jungle, garden, and more hikes.
We will be in Hawaii for the heart of whale watching season. There are lots of options for charters in Kailua-Kona.
See the sea turtles on one of many black sand beaches.