given the location of the event, and since they want it to be difficult how about the following:
snow, mountains, smog free skies, oh how the list could go on.
We did a similar activity here with video cameras, I think the hardest one for the kids to get was video of a dude with dreadlocks. Everyone went to the local video store and harrassed the same guy.
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It's all fun and games 'til somebody gets an eye poked out.
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