Hello Jessica,
The best places for clam digging on PEI are generally on the south side of the Island at low tide. Some places better known for clam digging are Maximeville, Pinette, Victoria or Tea Hill. There is a limit to what you can take, no more than 100 clams and the size can't be smaller than 2 inches. Feel free to visit the Department of Fisheries and Oceans website for the 'what do I need to know before I harvest shellfish' page to familiarize yourself with the rules and regulations.
You'll need a bucket, shovel and maybe water shoes to keep your feet protected.
Kelly