Will call Charter Club and book April 1-3 for the single supplement price of 5,500 pesos.
Seriously? Is that their price for "Two Nights/Three Days" in Guanajuato? I hope it includes a key to the city.
Approx. Roundtrip taxi to bus station in Tonala: $800 MXP
Approx. Roundtrip bus GDL to GTO: $800 MXP
Decent, mid-level GTO hotel for two nights: $1400 MXP
If you want to save money, skip the package tour and do it on your own. Either way, enjoy your trip. Guanajuato is unique.