You might like to do a 24 hours trip out of Prague. If you feel like it, this is an amazing place to visit. Terezin used to work a Nazi concentration camp and thousands of people were dead here during the IIWW. . It is not a pleasant visit but it is very enlightening.
Kutna Hora is the equivalent of Sintra or Toledo. I mean, a small city plenty of great monuments that you can visit in one day. There is a really good Baroque. The creepiest sight is the ossary. If you feel scared easily , don´t go. The rest of the city is really nice and deserves a visit.
One of my favourite places in the old town - and one of the last streets with a historical genius loci. I like to go there at night, it's a nice calm place
Took the overnight train from Krakow to Prague--(by the way, they call this the party train in whatever language you prefer)--and rolled into town around 6AM. With little sleep, strolling the beautiful streets seemed magical once in the city center. Spectacular architecture, buzzing with all kinds of life. We saw a most beautiful bride with her groom beneath that famous clock tower. And the bridges... Dined in a lovely restaurant along the "5th Ave" of Prague.