If I recall correctly, the RV park itself is in the restriction zone. There is very convenient & frequent bus that goes right past it to the subway line if you want to go into Mexico city. The sites are nice & grassy and the ruins are easy to get to from there.I was there 3 years ago and construction on the circle road made it a bit of a nightmare, i took a wrong turn and ended up heading into the city center at one point.
I came up from Puebla so I came in from the east then onto the secondary road into town above 132. It was fine. It was leaving where i got lost.
There is a sizable cathedral right by the RV park so you can use that as a landmark. The road in front of it intersects the road the RV park is on. There is a wall across the road form the Cathedral (some stores in front of it, so you may not be able to see it) and the RV park is effectively behind that wall.With your back to the front of the Cathedral, the RV park would be a right hand turn onto the street to your left. Lots of parking in front of the Cathedral so you can get out & walk to check it out.
