Daniel Bunting says kingfishers and otters are among wildlife affected on a stretch of River Stour.
Ryan Moore is honoured - having won the Ascot Gold Cup for the King's mother among many victories.
Investigators say the crash last summer was caused by a mechanical failure.
The tiny settlement becomes the first International DarkSky Community in England.
Visitors to a river captured by John Constable and now popular with stand up paddleboarders are asked to show respect.
The pilot, a man in his 80s, died at the scene and was the only person on board, police confirm.
Councillors say they want to visit the site before voting for its demolition.
The unveiling service was described as "moving" by former staff members of the defunct hospital.
More than £3,000 has been raised for the memorial, which will be unveiled on Thursday.
