Coat a large 7-8 quart crock pot with cooking spray OR line the crockpot with a crockpot liner bag (very easy cleanup).
Place the ham cut side down in the crock pot liner bag
Rub the brown sugar all over the ham, then pour the maple syrup and pineapple juice over the top.
Cook covered for 3-4 hours on low heat, or until a thermometer registers 140 degrees F when inserted into the thickest part of the ham.
Transfer the ham to a serving platter.
Pour the liquid from the bottom of the crock pot into a medium sized pan. (The glaze is fairly thin when it comes out of the crock pot, so transfer it to a pan on the stove top and simmer the glaze until it thickens. If you prefer a thicker glaze, you can whisk together 1 tablespoon of corn starch with 2 tablespoons of cold water and add it to the sauce pan when you simmer your liquid from the bottom of the crock pot.)
Place the pan over medium-high heat and bring the liquid to a simmer.
Cook for 6-8 minutes or until just thickened.
Pour the sauce over the ham. Decorate the serving platter with fresh herbs and fruit for beautiful presentation, if desired, then serve.