This issue has always been something I am conscious about when posting on the forum; My brother-in-law and I got on this forum when it was small, met some of the guys on it and became friends with some, it's been great. Now it has grown beyond just Alaska and has a huge following, it even gets the spam threads occasionally, it's big time!
What I try to do when posting (and no offense to everyone), is to be very vague about my trips; when I'm going, what is in my boat, where it is, etc, etc. You never know about the crazy people who are NOT boaters "casing" the forum for info on people. I don't post a picture of my boat or actually mention what size it is, only that it is a Sea Sport and is getting a new motor. I am cautious about mentioning when I am going on a trip, you just never know who could be out there working the forum like a puzzle to figuer out, who, what, where, and when.
Be safe and smart, don't advertise opportunities for crooks.