Wikipedia – Burgas (or Bourgas)
Buses from Sunny Beach bus station go very regularly to Bourgas. It cost 6 leva each way.
Here’s just a small selection of photos from the centre of Bourgas which I took when we went in September 2015.

If you get a bit lost, look at the skyline for Hotel Bulgaria. It fronts onto the main walkway and towards the main road where the bus station is
The central area shown below was all cordoned off in 2014. It’s now a large flat area with a nice, spacious atmosphere ….
The familiar chains can be found in Bourgas –
I stayed in hotel burgas the black one at the top of this page for my 40th birthday before catching the bus at the bus station across the road from it, for 150 leva to Athens to visit my sister and brother in Greece.