Bike Adventure to the Unknown
Pack water and snacks in a backpack and bring your bikes to an area of town you've never explored. Make a rule that you have to turn at every third intersection or flip a coin to decide your direction.
Follow your random route until you find something interesting—a weird statue, a hidden garden, an unexpected view. Take a break there and document your discovery with photos and GPS coordinates.
Use your phone to navigate back home via a completely different route. Stop for ice cream or a drink if you pass somewhere appealing, treating it as your reward for your adventurous spirits.