Wow! I can relate to the love of fishing, as I used to fish at night during the summer, but this is pushing it on a private pond. You put in the time, money, and sweat to make something special, and they should respect that.
The one person other than grandkids that I've allowed to fish at my place had to abide by some pretty strict rules, including no fishing around the feeders nor the dock. She's a great neighbor and has done lots of free bush hogging for me, so wanted to reward her. But if she did what your guests did, that would be the last time. Too much investment to let someone just abuse it!
