Harghita (and Sovata) County
Distance from Bucharest: appr.4 hours by car.
Things to see in the area:
– sf. Ana Lake
– Natural reservation Tinovul Mohos 
– Wildlife Park Ivo – http://www.vadaspark.ro/?lang=ro  – in the autumn the nature is outstanding
– Salt Mine Praid – http://www.salinapraid.ro/
– Mocanita Sovata (steam-powered locomotive), schedule available here: http://mocanitasovata.ro/, just in romanian