An account of the trail in northern England, starting in St. Bees on the Irish Sea and ending in Robin Hood's Bay on the North Sea.     Click on any of the photos to see an enlargement and cutline. Day Four - 9 miles, 2000 feet ascent Grasmere to Patterdale    The fourth day's walk offers three interesting possibilities. The path begins with a long ascent to Grisdale Tarn. Then it's time for a decision. The first and easiest option is to go down through the valley along Grisdale Beck to Patterdale. A second option is to take the high route over St. Sunday Crag. This adds about 1,000 feet in elevation and an extra hour to the day's journey. The third option is to traverse Helvellyn, which adds two miles and 1,500 feet in elevation and takes an extra two hours.    Unfortunately, this decision was made for me. When I arrived at Grisdale Tarn, both the high routes were covered in heavy mist. I opted for the valley and had an easy walk down into Patterdale.