I did this as part of a tour and you really don't need to spend a lot of time here. We used a car to get up to the view point. It wasn't crowded. The view is spectacular and you can see the different islands from there. I would also think the sunsets from here are glorious having witnessed them from the beaches. Something to do with the family or part of a day tour.
Great place to stop on the way to Karon and Kata beaches. Spectacular view.
Take your motorbike up the winding roads to the very top of the hill above Karon beach and be rewarded with spectacular views. Looking out over the changing colors of the water during sunset is truly magical. At the viewing platform you'll find plenty of other view-revelers, plus about half a dozen vendors selling snacks and fresh coconuts!
At the risk of sounding cliche, Karon View Point provides spectacular views stretching for miles with the 3 bays of Kata, Karon and Patong in your sight lines. Easily accessible by scooter or tuk-tuk. The view point gets quite busy as the day wears on. I'd recommend going earlier in the day and take in the view with a few drinks and breathe in the peaceful atmosphere. Make sure your camera is charged as you will want to capture the stunning aerial vantage point.There are also a couple of large eagles there that you can take photos with for a nominal fee of 100 Baht.
You can see 3 bays, Kata, Karon&Patong.