Which resort should I go to in Bulgaria and Croatia?

Bulgaria is cheaper and has many resorts on the black sea coastline. But Croatia is nicer and more peaceful....get to Split...then a ferry boat over to Hvar ...or many other islands...you have the best of both worlds then. Another nice,tranquil ,little island is kerkennah ..off the coast of Tunisia. I would suggest booking in April/May...or September/October to avoid the hustle and bustle of tourists. Even the coast resorts in Romania are nice..you can then bus or train up to the "danube delta(tulcea) to see wildlife....or go down to Bulgaria from there.. Romania is a great country to visit....

I would recommend the resorts on the Istrian coast - places like Rovinj, Porec, Pula etc if you want a beach holiday, they are interesting old towns with lots of Italian influence, you can also get boat trips across to places like Venice and along the coast. Alternatively Dubrovnik is worth it for the stunning city and the coastline around, there are various islands etc which are interesting and lots of boat trips etc. You can also go by bus inland or up to Slovenia or Italy If you are going to Dubrovnik the easiest way is to fly, if you are going to the Istrian coast its very easy to fly to Trieste and then get the bus down the coast.

I will recommend you Croatia, you can come also in Ohrid, Macedonia.