I will be in Merida in a few weeks and have seen that the weather will be in the 90's. I plan to bring shorts and short-sleeved shirts but wanted to inquire about the dress attire in the evenings for dinner? A friend of mine who used to live in Mexico once told me that people get dressed up to go out at night. I just want to make sure that I pack the appropriate clothing for my trip. All responses will be greatly appreciated. Thank you.