Yes thanks, Kelvingrove was one of the highlights of our stay in Glasgow. There was a recital on the massive organ in the foyer which was unforgettable. As for the Mackintosh stuff, Kelvingrove has a re-creation of one of his tearooms. Managed to cram in a lot of Mackintosh-related activities, including a guided tour of the School of Art (they've got tons of his furniture in there) and the library is stunning; a tour of the House for an Art Lover in Bellahouston Park, Willow Tea Rooms, Sauchiehall Street, and a tour of his recreated house at the Hunterian, plus a few other things.