Fossil hunting at Whitehaven - http://www.whitehavenfossils.co.uk/ It's mostly plant fossils but you get some very nice ones.
I took my two to Aira Force yesterday. Great fun stomping through the woods with lots to keep them engaged, and the waterfalls were bursting due to heavy rain so made for some exciting noise and sights. Car park is a total rip off, though we were lucky and someone kindly donated theirs with an hour left on it. Could tie it in with Rheged and the steamers as there is now a stop off point by the lake.