If your dog is courteous and calm in busy situations, take them with you to a local farmer's market. Dogs are usually allowed at these venues, but there are often lots of people and distractions. Your well-behaved dog will thrive in these markets and will simply enjoy calmly walking between booths and checking out fresh produce and local wares.
If your dog is certified as a therapy dog, you can give back to your community by signing up to visit a nursing home or hospital. This is the perfect activity for courteous dogs because their calm and approachable nature has incredible healing and health benefits for others.