Mitch K.
Yelp
This is one of the best preserved and best operated site of ancient ruins we have experienced. Not as grand and magnificent as those Mayan ruins on the Gulf Coast or in Guatemala, but this site is very manageable.
Get there early in the morning. They have parking for your car, but the area fills up fast. And the tour buses and tour groups pour into the site throughout the day. Obviously go during a week day as the Mexican families come on weekends and holidays. If you are taking a tour, it will most likely include a walking guide. If not on a tour...
Highly recommend you hire a guide. There are many who are around the ticket booth, so be receptive and make the determination if the guide's English is understandable to you. Guides are also available in other languages, but check ahead for availability. The price for a 2 - 3 hour tour is very reasonable.
Admission price for adults was 65 pesos for us, or about $3 - 5 US dollars, depending on the exchange rate at the time. The guide might have been 100 - 300 pesos, but well worth it.
You are walking mostly on the level central area, taking in the various buildings. Initially you will walk up a flight of about 12 steps, but they are about all the steps you will encounter. If you have a handicap, check ahead to see what you can accommodate.
You are out in the bright sun, so wear a broad brim hat. They sell hats like crazy by the parking lot, so if you forget or finally do decide that you need one, they are there. Vendors are very competitive.
Suggest you take the walking tour and then go into the museum behind the ticket booths. Interesting and more information, but rather limited displays.
Big news is that that is where the clean bathrooms are located. Take advantage of them.
We had lunch in their terraced cafe which was quite nice. Decent menu, service was good and the views were excellent. You are outdoors, in the sun, so if it is a hot day, well...you choose. But we were glad to take the break and did have wonderful soups an lite bites.
An adjacent site is visible across a valley from the Monte Alban ruins, but we did not visit it. One ruin in a day is plenty for us. But you might look at it