One of my favourite places in Bulgaria is the Arkutino reserve and the beaches which may be found there.
I've have added a photo album with some pcitures from there, you may see it here.
Nowhere else in Bulgaria can you find such densely populated and diverse habitats ranging from islands, cliffs, sandy beaches, bays, dunes, the Arkutino swamp, to forests and meadows, all lying along the last few kilometres of the river before it reaches the sea. The mild climate is ideal for the proliferation of a large variety of plants, and wildlife here again comes into its own with a large variety of predatory and other animals. The Arkutino swamp is also a bird sanctuary and thus a favourite nesting place for numerous birds, and boasts some rare species of cacti.