Not sure if any of us lot will be riding on the Saturday but we can certainly help recommending some trails. There is an epic ride out of Drumlanring called the Wanlockhead gold rush or close by is Mabie and Dalbeattie, both could be knocked off in a day. And theres Kirroughtree too which IMO is better enjoyed on a modern but could be retro'd! A play day at Glentress is possible as its not too far either.