Always close (and lock, if required) gates after passing them. This rule applies even if you know that you or someone else will be passing that same gate shortly afterwards. Always make sure that the gate is well closed and cannot open accidentally.
Keep a reasonable speed limit inside private grounds, be careful if you are crossing cattle grazing areas.
Use existing tracks, try to minimize cross-country and off road driving unless really necessary (notice that there is always one most-used access to each tank!). This will diminish the ecological impact on the ground.
Avoid driving along muddy tracks, as they might deteriorate rather soon.

NEA 01-02-03-06-07-08-09-10-16-17-21-22-31-32: located inside El Chacay Farm, along El Chacay road. The Auger Collaboration has a key for accessing these grounds. However, before entering El Chacay, inform persons in charge of the Estancia (Cacho Egea). Avoid contacting them during siesta time or on weekends (you may let them know before if you plan to enter the site at that time).
NEA 18-19-34-35-36-37: on Vallejos-Pavés grounds. To enter El Chacay Farm, same considerations as above. To cross the fence to the Vallejos and Paves grounds (beyond El Chacay) you will need to ask for the key for "Lindero de Piedra"-gate at El Chacay. Remember to return this key on your way back.
NEA 33: on Jaque grounds. Same considerations as above, then cross fence (no lock) to the Jaque grounds.
NEA 20: On Vallejos ground, but south of Mocho river. Access via El Chacay (see above). The key for the southern gate to Vallejos is at the Puesto Mendez, Mr. Palavecino has one copy of it. Return the key on your way back.
NEA 4-11-12-13-14-29-30: Access along the road starting across El Chacay administration. No locks, but inform at El Chacay if you enter their farm. Be careful with electrical fence at the end of  main entrance road.

Do not forget the following basic safety rules when entering the site:

Cell phone, backup person, warm clothing (even in summer!), GPS (make sure you know how to use it) and torchlight with FRESH batteries, shovel if driving to difficult areas, one or two wooden boards, DRINKING WATER in large quantities and First Aid Kit.