Here's a short list of what to see when you travel here.
Museo de las Momias/the Mummy Museum. These are not neatly wrapped, beautifully packaged Egyptian mummies, but accidental mummies. Dead people whose families could not, would not or were no longer around to pay for their departed's crypt space. Yes, there's a ick factor, but also fascination and a big dose of reality. Besides, everyone will want to know why you didn't see the mummies if you don't.
Tip: There are labels in Spanish and sometimes in English but get a guide who will tell you about the mummified corpses who range from newborn to seniors, rich to poor, peaceful to frightening.
You'll have to decide which is worse - the tourists who pulled of bits of mummified flesh for souvenirs (mummies are now safely behind plexiglass) or the prospect of looking like the mummies yourself. Fortunately, given the Mexican's light-hearted approach to death, vendors outside provide comic relief.
Tip: There's a nice banyo - 4 pesos - with an attendant who will make change.
Walk around the corner - slightly up hill - and you can see the cemetery where the mummies once resided.
Tip: You definitely want to take a cab here and you will still have stairs to climb but it's worth the effort.
Tip: The basilica and all of the churches here are worth seeing. As you walk by them, slip in and rest a bit.
Warning: There are stairs but if you enjoy seeing how an artist progresses through various styles this is worth it.
Tip: The good stuff is upstairs.
Next, a memorable meal, what I wish I'd seen and suggestions for the flattest way to see Guanajuato.