Да, Старый город находится в Созополе, а замок в 5 км. В Старом городе много храмов разного времени постройки. Там надо гулять спокойно. Можно посидеть в ресторанчиках. А замок -это новодел специально для туристов. Если будете рядом, тоже можно погулять там.

I believe the bus services are good. However truthfully I drove in a hired car to get there.

We stayed at The Laguna Beach Hotel and Spa on the outskirts of Sozopol. This area is being developed, but not overly so. Sozopol itself, and the Old town in particular, has little construction work on going. Bulgaria is pulling itself out of decades of communist rule and is only just starting to see the benefits of EU funding. If you go don't miss Ravadinovo Castle, a must for all ages.

Si puedes aparcar tranquilamente. En un gran parking al aire libre.

You can Go from Sunny beach to Burgas and then to Sozopol,from Sunny Beach to Burgas bus station ticket price is 4 lev. And from Burgas bus station to Sozopol also 4 lev ( so about 4 eur all Your journey). And it is easy to travel, because in Burgas station You will get out from one bus and there are bus to Sozopol at the same place.

Most people know restaurants. So find a restaurant in old town and ask the locals to point you in the right direction.

not that I'm aware of I used balkan holidays no problems have used them before