In Mexico, both the week before and the week after Easter are celebrated and, as a result, the town will be packed with vacationing Mexicans over the period. Traffic will be horrendous, there will be all-night hooting and whooping. The cheaper downtown hotels, restaurants and bars will be packed.
Los Muertos beach and the malecon will be wall-to-wall humanity. If you are staying way to the south or in the hotel zone or further to the north, you will not be impacted too much except for getting to, from and through downtown. Buena suerte.