Viator's web site lists Kona Airport as a pickup spot--it's a mistake! Pickup is at Hilo.
The tour was okay, but we were disappointed that we didn't get to see lava or get anywhere closer than what appears to be several miles from the main steam plume. The tour took us to two spots we really liked, the 1992 lava beach, which was a great walk, and another section of steam vents which was pretty and atmospheric on our cloudy day. Lava tube and waterfall were less exciting.