better off going here during the day.  It is very sketchy at night.  By sketchy I mean, I have seen way to many man doing it in the bushes, near the water, on the bench...etc. We've been offered crack, meth, exctasy, pot and blowjobs.  Well, not me, but my male counterparts have been offered to come to the bushes for a little boy fun. Yeah, be careful. There is a lot of  hazardous materials on the ground (goose poop, needles and used condoms) Review from Alyssa J P. I love the Back Bay Fens because I have a victory garden there. So I've started spending much more time there than I have in years past. (Side note: did you know the Back Bay Fens was originally built as a way to deal with sewage problems in the area? I'm sure that smelled awesome.) There are always creepy characters hanging out near the reeds, but they generally tend to ignore me which is for the best. I'm not sure if I'd want to hang out here at night though. Make sure to also check out the Kelliher rose garden and the war memorials. I think those are some of Boston's hidden secrets. Review from Beth B. What a treat! This park has it all....small pathways to discover, a track and field to use, and several nice sidewalk paths to bike, run, or walk. My first visit to the Fens was when the Rose garden was in full bloom--gorgeous! I also plan