Consider installing security and/or sensor lighting between your property and the water.
Keep trees & shrubs trimmed to reduce concealment opportunities and increase visibility of the waterfront from the property.
Create a visual barrier between your property and the water to identify where your private property starts.
Ensure a physical barrier such as a gate and padlock is erected at the beginning of your mooring, to prevent thieves gaining access to your boat, and it will also restrict those wanting to leave your home via the water.
Consider some type of identification marker, so you can establish from the water the identity of your property. For example the name of you home may be constructed as a sign on your waterfront property entry point.