Yes, If you keep it safe and sound, and the posse you're firing with is not too big then the police won't bother you.
We went to the beach the 20th and that was no problem as well.
All Sound Kings and Voladores Trueno 4, 5 and 6 that we had were fired, and although the bangs weren't as hard as in the city, we had good fun.
The Arroz Negra @ L'Estimat afterwards, accompagnied with that faint odour of gunpowder residue we had on our clothes tasted great!
One of the Tracas we lit in the city, in a small street. I can truly recommend this experience!