Renovations have made the Arlington Reservoir and beach this year. The water is clear and clean, and shallow enough a good length out for younger children and deep enough far from the shore for adults to swim laps. There are a few little water features that add to the fun, and a new playground will be completed sometime between fall '21 and summer '22. There are several large trees for shade, as well as a large sandy area. Also a nice large grass lawn. The snack bar currently has drinks and snacks. I believe they will have some lunch items again but as of August 2021 it’s just snacks. If you are driving, there is a parking lot adjacent to the beach and I have never seen it completely full. There is also a nice path around the reservoir for walking, running, and cycling. The Minuteman bike path is also nearby so you could easily bike over to the beach. Dogs are allowed on the beach off-season only and it’s a nice fenced-in area for them to play. Especially great for younger kids but people of all ages go with or without kids. You can buy a season pass or pay $5 for a day pass. The beach closes for swimming a couple of weeks before labor day and opens in late June.