Hi Stoberg! thank you for taking the time to write a review.
We do offer bike rentals with free navigation tips and suggestions on where to go.
Or a Self-guide bike trip to Karlstejn castle, which includes also:
navigation directions for your phone (better if it has internet data),
a phone holder,
train tickets to come back to Prague from Karlstejn,
water bottle
- that's why it's more expensive, as it has all the inclusions & services that normal bike rental does not include-https://www.prahabike.cz/self-guided-bike-tour-karlstejn-castle-country-river-bike-tour
We really do not try to rip off anybody(we would not survive here for 22 years otherwise ;)
We just like biking and offer good useful advices for travelers, which are usually greatly appreciated, and saves people time, money & helps to navigate around efficiently :)
The most important stay healthy, active, and enjoy the travels!