I will do my best to explain about Sunday's on the malecon. As many people already know, but for those that don't, Sunday is typically the day Mexican's set aside for their families (times are changing though).
Therefore, there are even more things to see, food to eat, goodies to buy on weekends on the malecon, especially Sundays. Yes, some things are geared towards tourists, but you will find that on Sunday, the malecon is PV's backyard. Lots of families, children playing, entertainers earning some pesoes, families selling souvineers, and all kinds of happenings. Many of the Mexican families on the malecon are locals, but many are Mexican families vacationing or on day trips to PV. In other words, it's the real thing, not just another tourist attraction.
PV has the malecon on Sunday, Guadalajara has the plazas on Sunday.
PV - a city with the feel of a town.