If you cannot get out there on your own, then I would suggest this tour. Transport was comfortable, pick-up point was convenient, and guide was laid back but knowledgeable. The lake is a beautiful site. I would also wish more time at the museum in the castle as that felt like a drive by.
Marko the guide was enthusiastic and informative. There was duplicate info/overlap between the two tours. Knowing that, I would just pick one or the other but not both.