That's awesome! Because so far when I visited a foreign country we only focused on urban tourist attractions and didn't dare to see the outdoors just because we were afraid the trails won't be marked and that we also needed a car to reach them. So you made my day with this news and we'll definitely include both the canyon and the caste in our itinerary!
No doubt about wanting to return someday as it always happened to us to see a country and then find out about some more places from the same country which we missed and made us want to return one day. In fact, I've been exploring Romania for almost 15 years and still didn't see all of it, so I can understand the struggle to have a good itinerary in just 5-6 days of staying. But will keep an eye out on your posts to steal some more destinations from Czehia for sure, haha :D
No problem, I will help you prepare the itinerary :) In fact, I don´t drive so I also use just trains, buses, public transport and my legs when I explore new places here so I will give you some tips on cool places (both urban and natural) that you can visit easily like that ;) In fact, there are amazing natural places even in Prague. Just google out some pictures of for example "Prokopské Údolí", "Divoká Šárka" or "Průhonický Park". I wrote posts about them too but it would take me ages to find them now :D
That's exactly how I trip too! Only with public transport or by walking. Thank you for some more recommendations, adding these to my list 😁