There aren't too many Marriott properties in Scotland, but I have to say I like the Edinburgh Dalmahoy property. The attraction for me is that it combines a little of the old style with the usual modern amenities. But mainly, it has 2 championship golf courses 100 yards from the front desk which have recently gone through renovation.
It's in the country and about a 30 minute drive into the center of the city. Food is good, esp the breakfasts. Don't forget to try some haggis with your bacon and bangers!