Moo Dee Bay (Loh Moo Dee in Thai) hosts a 300m-long white sand beach bordered by emerald waters. Situated on the east coast of Koh Phi Phi Don, it is the perfect escape from the crowd (at least until lunch time), Moo Dee Beach can be reached on foot from Tonsai East along a 1km path starting behind Bay View Resort; and from the path starting at the bottom of Phi Phi Viewpoint. A less tiring way to get there is to hire a long-tail boat near Tonsai jetty, which will take you to Moo Dee in about 15mn for a fee of 150/200 baht (you must test your bargaining skill).
Moo Dee Beach is really a cool spot; very quiet and relaxing in the morning, it is unfortunately visited by passing by speedboat day trips from Phuket and Krabi that perturb its peacefulness in the afternoon until 15:30. The beach offers its visitors pleasant snorkelling opportunities, mostly at both ends of the bay. A Rasta-run shack sells food and drinks (note that taking advantage of their situation on this secluded beach, their price for water is steep, so better come with your own bottle).