Place the graham crackers in a large zip-top bag and crush them with a rolling pin. Leave some small pieces for added texture.
If desired, toast the chopped pecans at 350°F for 5–8 minutes and allow them to cool.
Drain the maraschino cherries, reserving the juice, then coarsely chop the cherries.
Add the graham cracker crumbs, coconut, raisins, pecans, mini marshmallows, and chopped cherries to a large bowl.
Pour in the sweetened condensed milk and stir until the ingredients are thoroughly combined.
Add 2 tablespoons of reserved cherry juice and mix. Add the remaining tablespoon only if the mixture needs more moisture.
Lightly coat a 9×13-inch baking dish with nonstick cooking spray. Spoon the mixture into the dish and press it firmly and evenly into the pan.
Refrigerate for at least 3–4 hours, or until firm. Slice into squares or your preferred serving size.