Living near a park is nice. Living near a beach is even better. But for some Longboat Key residents who live near both a park and beach, frustrations have arisen as visitors to the shoreline have left trash and taken up parking.“The beach is a mess,” said resident Tommy Rheinlander.“They dig holes to build a sandcastle or whatever, and they just bury the trash in it,” said Lorraine Rheinlander.Cigarette butts, tents being left on the beach and d…