I'm doing a wedding in San Pancho, which is just 15min north of Sayulita. We decided to do San Pancho after finding the ceremony/reception place, not the other way around, so I don't know much about other locations. We're using Bungalows Lydia. I know in Sayulita, Don Pedro's palapa is very popular and there are a lot of villas.
As for coordinators, I contacted a bunch of them and got preliminary budgets. We were going to go with Kerry Moeller of Sayulita Wave because she charged the lowest fee and I wanted to do most of the planning anyway, but then there were long periods where she kind of dropped the ball on communication when we really needed to get in touch with her. Apparently her daughter had medical issues and she was going on vacation....so bad luck for us? I heard great things about Yazmin Gizeh of Sea of Dreams. Priscilla of Prisarvallarta.com gave us the best deals for all the items on our budget. Mishka of Mishka Designs is a bit pricier, but she's also a designer and can make your wedding personalized and incredible. Those were the main planners I contacted who are local to that area. Hope that helps!