A spectacular 65-foot waterfall pounds under a stone bridge and through a wooded ravine to feed into Ullswater. From the parking lot it's a 10-minute walk to the falls, with more-serious walks on Gowbarrow Fell and to the village of Dockray beyond. A new 1¼-mile footpath allows visitors to leave their cars at Glencoyne Bay, to the south, and walk through a deer park. Bring sturdy shoes, especially in wet or icy weather, when the paths can be treacherous. Just above Aira Force in the woods of Gowbarrow Park is the spot where, in 1802, William Wordsworth's sister Dorothy observed daffodils that, as she wrote, "tossed and reeled and danced and seemed as if they verily laughed with the wind that blew upon them." Two years later Wordsworth transformed his sister's words into the famous poem "I Wandered Lonely as a Cloud." Two centuries later, national park wardens patrol Gowbarrow Park in season to prevent tourists from picking the few remaining daffodils.