This is a beautiful waterfall and definitely a day trip as this place is about 2 hours away. I have included a link that describes more on what you can do there. Let me know if you are interested in going. Would love to coordinate a trip either before or after the wedding.
Rio Verde is a beautiful small city with a lot of color, fun and fun!
The most authentic place you can go to find food and souvenirs is a Mercado in Mexico.