It is possible to organise a combination of sightseeing and a walking tour, e.g. each day visit one place of interest and take a walk of 4-6 miles, having picnic lunch during the day outside and a proper dinner. If you are interested in this sort of tour, please look at the web site of the Wayfarers company (www.thewayfarers.com). I work as a tour leader for this company and it is great fun. You could either join their Czech Walk or I could make a similar/shorter one especially for you.