It's easy to get addicted to a place where truly beautiful colonial architecture contrasts with the exhuberance of the of the everpresent University students and the charro musicians who entertain at all times in the beautiful plazas. Founded upon a mining area, Guanajuato sits on a web of tunnels, which nowadays provide unique traffic arteries. Both the young and not-so young will have a delightful time! Do not miss the world-famous Festival Cervantino, held every year in October.
I spent a summer in Guanajuato two years ago. It's a charming town, take the tram up to see Pipila and enjoy the multi-colored houses from high up. See the creepy mummies and markets, and just relax. While it's not as lively as Mexico City, Guanajuato is still a good place to spend a few days.
Guanajuato is a well preserved and restored small town in Mexico. Although it's not very well known, and it's a little bit out of the way, it would be a mistake to miss it while traveling in Mexico. Even though it has a UNESCO world heritage status it is a very authentic place, not affected by tourism. When you walk the cobbled streets at night you can feel as if you were living hundreds years ago during the colonial time.
While staying in a Guanajuato hostel, don’t miss the old churches and convents. You can easily reach the city by bus, but it might be easier to rent a car since it is pretty remotely located. Hostels in Guanajuato are centrally located, and if booked in advance and nicely asked the proprietors can arrange to pick you up at the bus station. The friendly Guanajuato hostel staff can tell you about what’s going on at the time of your visit and tell you about the safe and active night spots (Guanajuato is also a very lively student town, so night life is very vivid).
There are also many cultural activities going on all the time in Guanajuato which makes it a good choice for a long stay if you're trying to learn Spanish. The emblem of Guanajuato is the frog, and the little green animal is represented everywhere. When booking your hostel in Guanajuato, if you plan to visit during the winter make sure you ask if the hostel has a heating system, and if the rooms are warm, since the town can be very cold in winter, and not all places have central heating, which could make it a rather uncomfortable experience.