So we went here as a family of 5 last year:
https://www.tripadvisor.co.uk/Hotel_Review-g1088372-d8296299-Reviews-Premier_Fort_Beach_Hotel-Sveti_Vlas_Burgas_Province.htm l
This was in Sveti Vlas which is along from Sunny Beach and a lot quieter with a nice enough village centre, restaurants...