Letná Park is a great place for early morning walk, afternoon stroll or a beer.

Site of the rather confusing Expo 58 Restaurant (the actual expo was in Brussels), a number of odd art installations (one below) and the Prague Metronome, Letná is a great place to relax and take in the wonderful views of Prague Old Town.
Given the lovely spring weather, I took the DJI Mavic Pro out for a quick spin around the metronome. You can watch the video below or on youtube in HD.