What options do I have to stop loud, fast boats on a lake?

Rainy day

What options do I have to stop loud, fast boats on a lake?

There’s only one: Lodge a complaint with your local police. They’ll inves­tigate whether the boats are properly equipped with a muffler or a bypass system (which diverts exhaust gases underwater when engaged) which they’re required to have when travelling within five nautical miles of shore. Operators of boats without mufflers, or with an unengaged bypass system, can be fined. See Small Vessel Regulations for more information and updates.

Unfortunately, there are no regulations governing how much noise a boat engine can make. And don’t bother calling your township; municipal noise bylaws don’t apply offshore. A complaint against the noisy-boat lovers will at least let them know that they’re bothering others.