La Chole hours

Can anyone tell me what days the museum at La Chole is open and if one day is better than an other to see the pyramid?

I believe it's open every day from 8 to 5. I'm unaware of why any day would be better than another to visit the restored pyramid. Local guides are usually available to answer questions. I recommend going before 2 in the afternoon since that is when traditional comida and siesta time is and locals may become scarce as they eat and seek out a hammock.