As an ex Ayrshireite, I have a patriotic duty to tell the world what a tremendous place to cycle Ayrshire is. Loads of quiet roads, big climbs and fast descents.
They’ve created this website to tell you where the good climbs are and helpfully graded them: http://www.ayrshirealps.org/
There’s also an 200km and 100km Audax on Sat 17th of August starting in Girvan- think I’ll give the 200km a go. They included some gravel roads too – they raced the Davie Bell memorial road race over so apparently it’s ok for a road bike.
Here’s the maps for the Audax: http://southcarrickdaviebell.wordpress.com/davie-bell-audax/