I swam 1 perimeter after work. The middle of the swim is a little bit impressive as the temperature drops noticeably and I spotted a sea lion 20 or 30 meters away. The second part of the swim is really nice as there is a breathtaking view of the SF skyline. Total distance is somewhere around 0.8 miles. I'll keep swimming it for the next few weeks, hopefully extending it to a double perimeter afterwards.