As a boater, you need to be aware of your surroundings at all times. It doesn't matter what time of the day it is. It doesn't matter what body of water you are on. If you neglect to pay attention, something bad could happen, such as an accident with another boater.
Here is something to consider: Many boating accidents occur towards the end of the day. There are many reasons for this, including the fact that the sun goes down and visibility is not nearly as good. Along with this, the longer the day goes on the more chance people have of drinking. And just the same as a motor vehicle, drinking and boating can have serious consequences.