Kusafiri Coffee Shop and Bakery may be the place I had an amazing cinnamon bun - although the counter service was inside and outside the Tusker House restaurant area, but not the actual Tusker House. The food cart had fruit, etc., but going inside--there was this cast iron skillet full of hot, gooey cinnamon buns that were to die for. Could be the skillet, there was a sterno underneath, I think, but it didn't matter. This place seemed to be the only pastry place in the park when DH needed it!
Also not to be missed-- a pint of something at the Rose & Crown. IMHO.