We did the tour of the castles a few days ago, our guide was ondrey, very nice guy, polite and makes you feel comfortable during the whole trip.
On the Kokorin castle tour we visited the highest top of the Tower where you can see all the surrounding forest.
Houska is very beautiful, however for people in love with horror like me it may leave you a little disappointed, I expected it better, however it is a nice castle to see and visit if you are in the Czech Republic. If you have more time and love trekking there are some trails to explore, but in this case I recommend going alone with a car to have no time constraints and enjoy everything as much as possible. Ondrey is very helpful in explaining the stories of both castles, you are free to ask any questions you want. Recommended.