The London Wetland Centre has been invaded by giant animals! Luckily they're a lot more static than the animals that live there all year round, so pose no threat to visitors. Follow a trail around the site and you'll find nine 1.5 metre creations made from Lego bricks, some of which were inspired by the real animals that live nearby. Hour-long workshops are available at weekends (£8.50, book in advance) in which you'll build your own Lego pumpkin to take home. The trail is included in the price of admission.