Transylvania tours from Bucharest include of course the most popular tour in Romania: the two most famous castles Peles Castle and Bran Castle (aka Dracula’s), in a one day tour, from Bucharest, but also the beautiful medieval city of Brasov .
The shared tour of the castles is the most popular, but I would suggest you take a private tour for a little extra cost. You will be glad you did.
In Transylvania there are over 150 Saxon villages with a Fortified Church. 7 of them included in UNESCO.
Another thing to add to the Transylvania tours from Bucharest would certainly be the visit to some local craftsmen like a real blacksmith within a Gypsy family, some ladies who still weave on a traditional wooden loom and a traditional lunch or dinner prepared by a local lady and served in her house. This would certainly add flavor to the tour and will help you to discover the real Romanian hospitality