Approximately 1500 kilometers in 7 days. Of course, you can significantly shorten the route, but only if you skip two very interesting places near the city of Turda, which is furthest away.
Day 1 - in the evening took a car at Bucharest airport and drove in the direction of Brasov. Overnight stay somewhere on the road.
Day 2 - in the morning got to the top of Bucegi National Park using cable car and saw the Sphinx.
After that we went to Poiana-Brasov, where spent the night at the top of the mountain. The cable car is open until 15:30.
Alternative / optional (places along the road) - you can visit the beautiful Peles castle (Castelul Peleş).
Day 3 - in the morning we walked in the old town of Brasov and visited Mount Tampa.
After lunch we went to Bran and visited the castle of Dracula.
Alternative / optional (places along the road) - you can see the fortress of Rasnov (Cetatea Râşnov).
Day 4 - This day we drove along the most beautiful road of Romania - Transfagarash, from the south (via Curtea de Argeş) to Baléa lake. Stopped near the Vidraru dam.
Stayed overnight near the Balea lake and walked in the mountains.
Alternative / optional (places along the road) - you can visit the Poenari castle (Cetatea Poenari). We also planned to visit it, but on that day a bear with cubs was walking near the castle and tourists were not allowed to go.
Day 5 - Went to Corvin Castle.
Then we visited the Red ravine.
Stayed overnight near the Turda gorge and walked in the gorge.
Alternative / optional (places along the road) - you can visit the city of Sibiu.
Day 6 - visited Turda salt mine
Went to Sighisoara, walked around the city
Alternative / extra (places along the road) - you can visit a beautiful fortified church in the town of Biertan.
Day 7 - Went the Saint Anna lake
Stayed overnight in Poiana-Brasov, we liked this place. In the evening we watched wild bears.
Day 8 - On the last day we visited Berca mud volcanoes. They are located pretty far away from the airport, but the place is very unusual.
Alternative / additional (places on the road) - any places on the way to the airport from Brasov.