I went to Guadalajara many years ago and met lots of guys. There was a cruisy park in the pedestrian part of the center near the large church. I was approached by guys. Not sure about how it works now, but Grindr is probably a better and easier way to meet guys. There's a huge gay scene there and it's a very large city, so I think your chances are good. I met a really hot soldier in the park (parque revolution) one night. Still think about him. Also saunas were quite active. I was staying in a hotel, but had no problems bringing guys back to my room. I'd like to go back and get an Airbnb.
Like I said, it has been a while for me, but I had a good experience there. I'd say go for it!