Let your delegates pick and eat as many delicious oysters as they wish. Put on waders and walk into the shallow ocean of the Danish west coast.
Get a 3 km guided tour out to the oyster beds and pick your own oysters. After hours in waders and loads of fresh air, the day could easily end with a top-quality oyster dinner.
Fun fact: Five hundred years ago, an adventure like this could have had fatal consequences. Denmark's King Frederik II forced a monopoly on oysters and trespassers would be sentenced to death the third time they got caught.