I'm glad you're getting the chance to come back and see them again! There are currently nine lighthouses that are open seasonally for visitors to enjoy. West Point, Tignish Run, Leard's front Range Light (Victoria by the Sea) , Point Prim, Wood Islands, Cape Bear, Panmure Island, Souris and East Point. Seven of them offer you the opportunity to climb to the top for a small fee. They are generally open from mid June to mid September, with a couple of them having longer seaons than that.
You can get more information on these and other lighthouses on PEI on the PEI Lighthouse Society website.