One that takes you to a lovely location and once found leaves you with a sense of fulfilment having enjoyed the place that you have just been to. A hidden gorge, a small church at the top of a mountain, a footpath with a stunning view, a cave at the side of the road, a peacful and idyllic river (while kayaking for those water based caches) etc...
This could mean that it is an earthcache, a traditional, a letterbox, a mystery, a multi, a virtual, a wherigo - at some point every one of these types have taken us to locations where we have been and it was a delight to have been taken there. It is also those times when we give out favourite points (which sort of links on with the OP)
Tim