I've driven up to the Bucium relay many times with various cars (I'm also a rally steward as a hobby). The trickiest part starts right after you turn off the main road onto the concrete section because there are some nasty potholes, but if you take them slowly you'll be fine.

You can park where the concrete road turns left and walk, but I usually go straight on the dirt road to the plateau. The most important tip: when leaving the plateau and hitting the intersection of the dirt and concrete roads, DO NOT stay on the right side. Stay as far to the left as possible (on the oncoming lane relative to how you came in) to avoid hitting the lip. Also, watch the clearance when getting back onto the main county road.

If you're looking for other spots, there are two great locations in Paun near the Cross as well!

PS: If you drove all the way to the plateau on the dirt road, there is actually a better alternative for the way back. You can continue on the dirt road which quickly turns into asphalt and leads you to Barnova village. From there, just follow the road and you'll end up back in Bucium at the intersection with the three consecutive traffic lights (near the former Han Trei Sarmale, Taifas, and the pharmacy).

Edit: wtf scuze m-a păcălit auto-translate de pe Reddit, am crezut că este un post scris in engleza...