Nature will probably become green much sooner than last year so consider one day trip from Prague to this beautiful area for amazing views and hike in forests and meadows.
From Prague, take a bus from Smíchovské nádraží, no. 390, change at Štěchovice to bus no. 438 to Vysoký Újezd. If you want to make your trip shorter or go further to Štěchovice for example, you can also get off already at "Krňany, Teletín".
See map: http://mapy.cz/s/9qGd
Follow blue trail direction Rabyně for 2 km to crossroads called "Pexův luh" where you change to yellow. From there it is only 6,5 km to Třebsín so it's really not a challenging hike:)
If you have GPS, consider small detour to one extra beautiful view at
N 49° 49.505 E 014° 27.012 (or http://mapy.cz/s/9yK0 )
After passing Teletín, you will reach detour to view called "Máj" (May) which is 101% worth visiting. You may need map to continue as there were too many marks missing in the next part of the trail.
Shortly before reaching Třebsín, take another detour to Smetanova vyhlídka (view).
When you reach road, there is a station of bus no. 438 (station called "Krňany, rozc. Třebsín").
You can also continue further (for example up to Štěchovice); just a
little longer on blue marked trail "to the left" (direction Štěchovice)
and you can stop at "Usedlost Medník", little local farm. If you're
lucky you can get wonderful products (milk, "tvaroh", meat...). It is
very close to next station of bus 438 called "Krňany, Závist, u křížku", a bit back following the main road (exactly here: http://mapy.cz/s/9yKA )