Years ago I created a printable guide that will detail everything you need to know to get and romance each pinata species. Because the new forums deleted the old threads on this, I am re-posting the link for those lucky enough to have discovered this great game. I am not sure what version of my guide this is, but you have any questions just let me know via a post here or a PM.
http://pinataisland.info/images/8/82/VivaPinataTIP.pdf