From an article in the Denver Post some good advice and some bad.
It's a tradition maintained since the 17th century and favored especially among young sweethearts because, as our guide, Braulio Rosales Diaz, explained, "The in-laws can't see both of you." Take sustenance at Los Almendros on Calle 57 and get a taste of the Yucatan at its most authentic, especially if you ask for poc chuc, slices of grilled marinated beef covered with onions; or pollo pibil, perfectly seasoned chicken wrapped in banana leaves.
Then stroll - or, better yet, rent a calesa, a horse-drawn buggy - along the broad Paseo de Montejo, lined on either side by ornate 19th-century homes, many converted into offices, and by a tree canopy offering shelter from the tropical sun.
Calesas depart from the main plaza and also travel along the Paseo de Montejo to the Monumento a la Patria. A one-hour buggy ride costs as little as $12, but agree on a price before you start. Because of weekday vehicular traffic, buggy tours are most enjoyable on Sundays.
The good advice is to take a buggy ride through town because you notice details that you miss when walking or driving in a car. It's the perfect pace for seeing the city of Merida. The bad advice....eat at Los Almendros! Don't!