If you have a rough idea of a location, you can use the excellent world map at multimap.com.
I plan to see the ruins at Mayapan, Yucatan, which you can read a little about here.
I also intend to visit the runis at Muyil, in Quintana Roo,which are a little south of Tulum, and which you can read a about in 1 and 2.
Chichen Itza, Labna