We laughed when we read the previous yelper's advice to "follow your instincts" but he ended up…read morebeing totally right! Actually it was my bf's instincts that we should have followed bc he pointed at a small dirt road and said "I think we're supposed to turn there" and I suggested driving around more after looking dubiously at it. Whoops! Turned out he was right! After we drove around for 30+ minutes zig zagging back and forth, we finally asked the right person for directions and it turned out that was exactly the road we should have gone down haha :)
So here's how we got here: If you're driving NE on Hwy 3 (from Ensenada), drive past the small town of San Antonio de las Minas, and after a minute or two, take the first U-turn, then make a right at the first paved road after the U-turn. Follow the paved road for 5ish minutes, then cross the street at the intersection where it hits "Carretera el Tigre" and then keep going straight on the dirt road. Follow the dirt road and you'll almost immediately start seeing signs for Rancho Cortes. Stay right on the fork that has no signs, and you'll find it after a few minutes. Hard earned directions! I uploaded a google map snapshot of exactly where the dirt road starts, hope that helps!
The cheese cave was way more low key than I had expected, but it was still a fun quick pitstop. The boy manning the desk was shy but showed us around and we generally got the gist of what he was saying between his limited English, our limited Spanish, and a lot of gesturing. He charged us 35 pesos total to take the two of us to the cave and gave us each tastings of five cheeses. The cheeses were good but overwhelmingly strong so I was craving wine or anything to cut the taste of the strong cheese by the last tasting.
Good luck finding it!