Preheat oven to 325 degrees. Grease a 9 inch springform pan. Double wrap the outside of the pan with foil.
Make the crust. Mix ginger snap crumbs with melted butter and sugar. Press into the bottom of the springform pan. Bake for 10 minutes. Cool.
Beat the cream cheese base. In a large bowl, beat cream cheese until smooth. Add sugar slowly. Mix well.
Beat in the eggs, one at a time. Scrape the bowl sides as needed. Keep the mixture very creamy.
Stir in the sour cream, lime juice, zest and vanilla. Blend until smooth. No lumps!
Pour the filling over the crust. Place the pan in a roasting pan. Add hot water halfway up the sides of the springform pan.
Bake the cheesecake for 1 hour until the center is still slightly jiggly. Turn off the oven. Crack the door and let the cheesecake cool for one more hour in the oven.
Remove from the water. Refrigerate for at least 4 hours. Loosen the edges with a knife.
Once cooled, add the topping. Mix sour cream, powdered sugar, zest and spread on the chilled cheesecake. Chill for another 30 minutes.
Run a knife around the edges and remove the ring. Slice, serve and enjoy!