We spent 4 or 5 days there, and my recommendation would be to head up to Cashtal yn Ard, stopping off at King Orry's grave and the spiral stone on the way. More modern, but interesting was a churchyard just up from Cashtal yn ard that had loads of crosses and carvings - it's near Maughold on the coast. If a little more time, see Laxeys wheel as the Manx are quite proud of it. And of course, drive very fast on the TT course...

have fun.

Sam