A little further upriver a gleaming white bank shimmered from the other side of the river and as I got closer I realized the beach was made up entirely of shells.
We were handed out eye patches with a sheet (detailing various uses of the patch) that we had to use to solve the first riddle which was performed on the stage and once we had the answer to that, we raced off to find another clue. The final answers are given on this link, you'll understand the depth of the riddles and the thinking that was involved in solving them. The 5 answers we needed could be obtained in any order so we decided to go to the ones which were the furthest away and work our way back towards the stage.
We got the other 3 clues and felt really proud of ourselves having got this far, and walked to the stage to await the final clue. But when it was announced nothing happened on stage. We were flummoxed. We thought we had an idea of where we should go so rushed to the location hoping we'd be enlightened upon arriving.
This link is a beautifully written account about his dog, Harry. Have tissues handy.