At the cottage, consider a biological toilet as an alternative to septic tanks. Take it back to shore and dispose of it properly. Avoid the temptation to top off your gas tank when refuelling. It may result in a small, but toxic, gas spill. Watch your wake, especially if you're within 150 metres of the shore.
Waves cause shoreline erosion and can disrupt wildlife habitat.
Be cautious if you use chemical cleansers, paints and antifouling compounds on your boat. If your cottage is located on or near a bank or shore, preserve as much as possible of the natural vegetation between the cottage and the water, to reduce rainfall runoff that may contain harmful sewage organisms. Plant new shrubs and trees if need be. Help preserve local wildlife - avoid chasing birds with power boats, disturbing bird nesting areas, filling in wetlands or altering shorelines. Choose less polluting activities such as cross country skiing, hiking or sailing instead of motorized sports.