Donegal Town Bank Walk

Follow this lovely flat trail along the west bank of the River Eske and Donegal Bay. The myriad trees offer shade and have labels as to their type; frequent benches allow you to pause and soak up the views. Look out for the little fairy doors in the trees; there's even a postbox for children to write letters to fairies.
It's 1.5km each way and begins on the west side of the Killybeg Rd/N56 bridge. (info from the Lonely Planet website)