I found this great resource to supplement my planning to Bohemian Switzerland: Cuddly Nest (search for Bohemian Park Switzerland)

Weather remains pleasant there in September, with warm temperatures but smaller crowds than July/August high season. Winters from October to April can be quite cold and snowy, limiting some trails and facilities.

One of the easier access points from the capital is a direct train, though a bus is also an option. Driving provides flexibility too. Within the park, hiking, camping, climbing, boating and biking await.
Notable rock formations include the largest natural sandstone arch and canyon in Europe. Diverse wildlife like squirrels, falcons, storks and lynx can be spotted from trails and scenic viewpoints.

One thing that I’m still looking for is a local guide who can show me around the park and share some insights and stories. I had a great experience with GoWithGuide when I visited Prague, but I’m not sure if they offer tours to Bohemian Switzerland. Does anyone have any recommendations for a good local guide or tour company? I would appreciate any suggestions.

(Moderator's note: I deleted the links to the Cuddly and GoWithGuide websites, as forum policies generally prohibit such links within a post. If you're interested in either of these resources, please send a private mail (PM) to the poster and ask for the link.)