\link{http://www.redspottedhanky.com/find-the-fox/?utm_campaign=fitb&utm_source=click&utm_medium=email&utm_term=findoutmore"Find the Fox in a Box" at 6 different wildlife parks} (actually it was 8 parks but 2 have already happened)
You get a £20 e-voucher for completing the challenge, plus a £100 prize at each park, & a prize draw overall too.
redspotted hanky are great - prices as cheap as any other trains site, no booking fee, & \link{http://www.tesco.com/clubcard/deals/product.aspx?R=1916&%20bci=4294967191|Travel*4294958884|Transport\2-for-1 with Tesco vouchers} 
(used to be 3-for-1 but you can't have everything)