Whenever I come home from a trip and find out that I have not another planed, I want to plan one. And free travel guides are a great way to get inspiration.
Visit stigalbeck.com to get free travel guides both in English and Danish. The books are short, go through all the most important attractions and include maps. On a trip I would still bring Politikkens Visuelle Guide or Lonely Planet but they are great to get me inspired.
Arrivalguides also provide short and precise guides for free.