Travel 100 metres without being seen.
Put on a performance for a CCTV controller. You could improvise a short play, show off a dance routine or hold a full blown talent show.
Go guerrilla and change a place with plants.
Become a citizen of the new nation of Nowhereisland: a Nowhereian.
Go for a walk; bring back your favourite memory and then recreate it.
Become a Champion Worm Charmer!
Collect 26 photos of the letters A-Z in different places.
On this trail, when you cycle at your normal speed you're travelling at about ten times the speed of light. Can you travel ten times slower than you normally would without falling off your...
You are currently at the Sun, over 3.5 billion miles away from the edge of our solar system. Cycle there and create an astronaut report detailing your successful mission.
You are currently on Pluto, over 3.5 billion miles away from the Sun. Cycle there!