I want to go this weekend to SLP to the Huasteca Potosina. This is one of the most beautiful places in the north of Mexico and there are many things to do. The travel will begin the friday at 9 pm and end the tuesday at 6 am. Its a very fast trip. This weekend is a Holyday in Mexico and the Monday most of the people doesn't works.
Then we visit Xilitla its and magical place when Edward James built a magnific house in surrealistic way. Also has pools to swim. After that, we go to the place called "Sotano de las golondrinas" its a big hole when a thousands of birds go out when the sun rises.
Then we visit the waterfalls called "Tamul" that are amazing! and also we visit the "micos Waterfalls" that has beatifull rivers and beautifull waterfalls, also you can swim and do another activities there.
Yo can find more photos and information in Google, or visit: http://www.revistabuenviaje.com/conocemexico/destinos/slp/cascadashuasteca/cascadas.php
The cost is between 1300 and 1600 per person including meals and entrances. All is in public transportarion. If you want to go you must tell me quick, because there are only a few seats in the bus and you have to reserve the seats.