appart from the arcs the ecotouristic project of the unhabitants of San Francisco Magú has some other possible activities, all of them are just a complement to the visit of the aqueduct.
First of all you can get down to the small river running below the arcs to get another view of the monument, you can swim in a small lake almost at the end of the walking tour, you can take a journey trought a zip line or you can do some horse riding supervised by one of the community members. Your last choose is to have a picnic.
This activities are specially meant for the visitors from the offsprings of Mexico City, wich travel to this rural town to escape from the immensity and stress of the City, none of them is a spectacular option to spend your day, but they are great for most of the park visitors wich are often poor families. If you are traveling with children they might be attracted by some of this activities, it will be a good way to spend their time and to have a little of fresh air.
As I said in My introduction the aqueduct, or arcs of the site, are the main, if not the only, touristic atraction in this small town. The construction of this monument began in 1703 by the company of Jesus and it wasn't finished until 1854, the objetive of the aqueduct was to send waters from the Oro river to the Hacienda de Xalpa (a country estate). I don't know if it ever worked for the use it was supposed to have, but if it did it has been a long time since it dried off.
The aqueduct is 483 meters long and 61 meters high, it has four levels, the first with 43 arcs, the second with eight and the last two with two arcs each.
After you arrive to the park the typical visit consists in walking from side to side at the top of the arcs, then you can choose to either return once again walkin trought the aqueduct or doing the whole walk in the park, this walk will have different viewpoints and bridges to cross the precipice, depending on how fast you walk and how much you stop at the viewpoints the route could take you between half an hour or one hour.
The touristic project in this place is managed only by the small community of San Francisco Magú, and they don't have enough employees to take care of everything so it would be great if You help them by following some simple rules during your visit, rules that unfortunately are ignored by many visitors. When you are crossing the bridges don't shake them, and You should only cross the aqueduct trought it highest level, many people walks between the arcs wich is forbbiden both for your security and for the monument preservation.
There is a small fee to pay to enter the park, wich is opened everyday from 8 am to 7 pm.
There is a cafateria at the touristic centre, but the day we were at the arcs they were selling almost nothing, you could only find junk food.
Outside the parking lot, and in several places on the road from Tepotzotlán to San Francisco Magú there are small places in wich people from nearby towns sell some typical food, I did not eat on any of them but if you are confident that they are going to give you clean and tasty food you can give a try to any of them, they will be quite cheap and the dishes won't be much different to the food you eat on any mexican city.
If this option is not for you then you should eat at Tepotzotlán before or after visiting the aqueduct, there are several restaurants on the town so you'll surely find one you like.
As far as I know the only way to arrive to the arcs is driving from the city of Tepotzotlán.
Since I would not recommend you to rent a car in Mexico, as the driving could be confusing and sometimes dangerous, you should travel to San Francisco Magú using a taxi, wich you can take at Tepotzotlán downtown. The travel will take you 15 or 20 minutes, I didn't see any taxis waiting for visitors while I was at the arcs, so it would be a good idea to talk to your driver so he picks you up one or two hours after you arrive so he takes you back to the city, otherwise finding a way back could be a little complicated.
It would be a good idea that the municipality put a bus service from San Francisco Magú to Tepotzotlán for the many visitors wich decide to see both attractions, but as far as I know such service does not exists.