Here is a challenge for you.
Design an active, outdoor game that demonstrates the interdependence of different species in food webs. It could be something like a 'tiggy' game where people play different roles - perhaps those of producer, primary consumer, secondary consumer and the gruesome decomposers....
We will play the best game. Try to keep it simple, active and fun, whilst reinforcing the concepts we have been learning.
p.s. post your ideas here for feedback - you could refine your ideas collaboratively online. Isn't that what you do in games like Runescape?