Mix pretzels, graham crackers, rice cereal squares, cranberries, almonds, and marshmallows together in a large bowl.
Line a large baking sheet or your countertop with waxed paper.
Melt almond bark in a microwave-safe glass or ceramic bowl in 15-second intervals, stirring after each melting, 1 to 3 minutes. Add almond extract and immediately toss into the bowl with the snack mixture. Mix gently until well coated. Spread onto the waxed paper by hand to make a thin layer. Let cool until almond bark is set, 1 to 2 hours.