I love Etruscan culture, so I was very excited to find this museum full of Etruscan riches and history.  Perugia is a fairly small city, so if you just ask anyone "Museo Etrusco?" or something like that (yeah, I know, it's probably bad Italian) they can point you in the right direction.  It is in a former abbey and just beautiful.  The only bad part is that all the tags on the displays are in Italian only, which is not unreasonable to expect ( we're in Italy after all), but it'd be nice if at least a booklet in English and other languages was available to check out and take around with you.  FYI:  The Etruscans were quite unusual for ancient cultures in their treatment of women.  Women were on a nearly equal status with men.  Furthermore, in many ancient cultures, the phallus was used as a shape for jewelry and decoration motifs as a fertility symbol, but in Etruscan culture the female genitalia was used just as often.  Sounds kinda gross, but it's not.  This museum is definitely worth checking out.

If you are not into snakes, your first impression of the name "Reptile Gardens" might be revulsion.  But don't let that stop you; there is a lot to see there besides snakes, including "Prairie Dog Town".  It's a great family attraction.

http://www.reptilegardens.com/

The YHA hostel here bites it.  In this city, it's worth splurging on a hotel, especially in the summer. You will need AC!

What a beautiful place.  They give you an extensive tour, and there is a lot to learn about the place's fascinating history.  All the people there to greet you are young and beautiful, which is a little weird (where do they keep the old folks???) but it's a pleasant experience.