I cannot stress enough the fact that the way to travel is definitely during the low season. I've been to many beach destinations, usually during high season, and have found it to be overwhelming.
Puerto Vallarta is a charming town with fun for everyone, whether you are traveling with friends, family, or a more adventurous you emerges and you decide to go alone like I did. It's a wonderful place for honeymooners as there's lots of romantic places to dine, or just lock yourself all week in your room, admiring the incredible sunsets from your balcony. I saw lots of families as well, which leads me to beleive that it can be enjoyed by one and all.