I was going to say Sea Scout, but I was too late
Boat Angel, Boat US, Kars4Kids, etc... all want donations. They don't want wrecks. You may not agree with how each charity is run and/or where the $ goes.
Could always list it on craigslist at $500 or something. "Free" really brings out the bozos, but if'n you're bored....
However, for boats with lead keels (like Catalinas) there usually is somebody that will take a wreck. The lead is worth quite a bit as scrap. The keel of a C-27 is worth ~$700+ around here. Add in the mast, the stainless, etc... The fiberglass does, unfortunately, end up in a landfill if the scrapper is reputable. Steel keels aren't worth the effort.