Place the ham in a roasting pan and tightly tent with aluminum foil. Follow directions on package to heat. Remove from oven 30 minutes before heating is complete.
Remove the pineapple slices from the can, reserving the juice for the glaze. Affix the pineapple slices with a cherry in the center of each all over the ham using toothpicks. Push 3 or 4 whole cloves into each pineapple slice if desired. When finished, pour glaze over the ham and into the spiral cuts, reserving enough for a second glazing at serving time.
Carefully re-tent the ham with the aluminum foil and return to the oven for the remaining 30 minutes of cook time.
When ham is finished cooking, remove from oven and follow package directions for resting before serving. Just before serving, remove the pineapples and cherries and set on the serving platter with the ham. Pour remaining glaze over the ham and serve.