You have to be there at the crack of dawn, before they move into the trees, around 8:30. The two best spots, at least that I have found are about 3 miles north of Los Alamos National Labs on Hwy 4 past the intersection with NM 502. You can short cut through the main gate of LANL on Jemez Rd. Just have a valid ID. When you get to the elk crossing sign, slow down, they will cross right in front of you. They are around until you get to the hair pin curve. A little further along, you will see a parking area for trails at Bandolier National Monument - a lot of times there is mule deer herd around that area. As you keep going you will get to the Caldera. There is a nice herd that you can usually see from the road. But look on both sides. If you see one coming up the hill towards the road, he will cross in front of you.