My daughter is marrying in June, 2009 in PV. We went in January to look at the church, reception sites, etc. We have tried doing the coordinating ourselves which is difficult being out of country. I would suggest using a wedding coordinating service. The fee looked high at first, but now I think it would have been worth it. Some of the vendors we have had excellent luck with to this point are Vallarta Flowers, L & A Photography, Ray at PromoVision for the video, & Rosario at Casa Magna Marriott Hotel. Our big hang up has been securing music, but Vallarta Vows is working with us on that.
Good luck with your planning! It is a beautiful place!