I considered going over the side of one of the local ferries with weights on. 600+ feet of water in mid-Sound, so they wouldn't have found my body, and there are points on the ferries where it's possible to go over the side without anyone noticing (especially at night). I eventually decided otherwise for a number of reasons, but prominent among them was the awareness both that the inevitable search for me would be an expensive waste of resources and that there would be no closure for my family, just a never ending question of wondering whether I was or wasn't dead. I didn't want to leave everyone with a final tease of hope that I might someday reappear. Even with notes left behind, it didn't feel kind to my mother and sister; they wouldn't want to believe the notes, so they would always doubt them.
Just my own experience and thoughts, in case they're of any use to your own decision making process.