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The newest evening time passers are the murder mystery dinner theater put on by Murder in Mexico, at Las Flores Beach Hotel on Tuesday nights.
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at Hotel Playa Mazatlan, which is on monthly between November and March. Approach the concierge at the hotel there to book.
Mazatlan's hometown baseball team, the Venados, have been playing in Mexico's winter leageu (Liga Pacifica) since 1945, though the stadium itself dates from 1960. There's really not a bad seat in the house and prices are cheap (and so is the food and beer). If you're planning to go to a game, it might be better to take a bus or a taxi because there is no parking lot and street parking is tight.
This is tourist country!
Great Mazatlan Aquarium
Has bird, seal, and diving shows.
Condominios Miramar
Although an otherwise unremarkable building, the beachfront condominium tower where infamous drug lord Joaquín "El Chapo" Guzmán was arrested in 2014 (he later escaped) has become somewhat of a tourist attraction, or at least a mildly-popular photo opportunity. You cannot enter the building.
Also tourist country!