We're going to Norfolk for 2 weeks in August staying at a relatives holiday home in Heacham. We've been there a few times and have done go karting in Cromer, golf and tennis in Hunstanton, bike rides and the beach at Wells but can anyone recommend anything else? we have four boys of 14, 14, 13 and 9. We've had a tough year financially and thankfully are not having to pay for accommodation so would like some recommendations to make this a fun but cheapish holiday...