Vitosha
is a magnificent landmark mountain rising just south of the capital. It is easily accessible by public transportation or by car and day trips in Vitosha in a sunny day are highly recommended. In the winter it is well suited for skiing (http://www.skivitosha.com/) and its proximity allows one day ski-trips; in the summer it is great for hiking. A great way to spend few days in Sofia, being on its "balcony," enjoying sunny days on the mountain with a spectacular view on the capital. So going to Sofia provide gives you a unique chance to witness the rare symbiosis of the metropolitan city with its nature park.Rila Monastery is the most famous monastery in Bulgaria, situated in the huge Rila Massive. It`s just one hour and a half drive away from Sofia.
Plovdiv is a large city in Bulgaria. It`s just one hour drive on a good highway away from Sofia. Plovdiv lies around three hills in the otherwise totally flat Thracian plain. It's historical center, Roman remnants & relaxed feeling make it a great day-trip.
Veliko Turnovo a beautiful city along a winding river, the former capital of Bulgaria in the middle ages. The original city castle and walls are reconstructed. Be sure also to visit nearby Arbanassi.
There are also many monasteries around Sofia.
