Rancho's a cool place, but the crowds seem to have gotten to it. Also, January/February are not the best months there surfwise, but hopefully you'll get lucky.
My advice would be:
If you get there and Rancho's not working, but Popoyo is- don't hang back and relax by the pool. Take the long walk to Popoyo and get the waves in while you can (even if it's packed). Because of the three times I've been to that area, only once did I go in January, and there was no surf at all the whole second week of the trip. Anywhere. I thought I knew the waves there too well, and expected Rancho to fire up again, and I let a few days the first week go by because it was only working at Popoyo and I: don't like that wave as much, didn't feel like walking around the Magnificent Rock Cliff, and it was PACKED.
When it's on, Rancho's left (especially right off the cliffrock) is awesome. Fast and powerful barrel sections. Popoyo is a softer, fatter, but usually bigger wave. It's a reefbreak with much clearer water than Rancho, so if you're gonna do a long session at Popoyo- use some sunscreen. It feels sort of like a southshore Hawai'i spot (Popoyo.) It's got blue water, that reefy smell, and long rolling soft waves that you can really dig into, with a nice easy inside pocket under the lip.
Have fun dude!
