During my 2 days trip to Sierra Gorda de Queretaro, I've managed to take the 1,5 hours driving from Jalpan to Xilitla, where out of the village and apparently in the middle of nowhere, you'll find the entry to Las Pozas. The gardens are open every year and there is a small entry fee. The main "palace" is very close and visible from the unpaved dirty street you have to take in order to get to Las Pozas (it may become particularly hard to drive, after a rainy day (luckily it wasn't out case). The gardens and concrete structures are well integrated into a main surrealistic environment, many of the concrete structures are just "useless" and just for beauty, mostly representing flowers or bamboo. Particularly remarkable are the "stairs to nowhere", with no handrail and scary to climb (luckily the scariest steps where closed, in order to mantain the integrity of the structure). It took little more than an hour in order to visit Las Pozas, it wasnt crowded when we were there on a Monday morning. We could have stayed longer and seim in the pozas just down a spectacular waterfall, but we left the swimsuits in the car and the water was not as warm as in other places of the Sierra. All in all, a worthy detour if you plan to visit Sierra Gorda and have an overnight stay in Jalpan