Airfields and Aerodromes Here you'll see most of the airfields.
I think some of the most interesting sites is the small islands.
Endelave is indeed very nice and is 50dkk (app. 5£). There is also Samsø, Anholt, Læsø, Femø etc.
Stauning is also interesting for the museeum.
Heard that Wyk auf Föhr in Germany just before crossing the border to Denmark should also be nice.
To really avoid is only Copenhagen Kastrup. Most other airfields are normally around 10£, even the larger like Billund and Århus Tirstrup.
You could try posting on the Danish
Pilots.dk - Den danske luftfartsportal. You will for sure get a lot of hints to nice places.
pm me if you need specific info on something.