The GAP Tail is such an asset to the Southside! Just a few blocks off Carson St. and you have river views, greenery, and a paved trail for jogging, biking, roller blading, or walking. The trail between 4th and 18th can sometimes feel secluded, but on beautiful Pittsburgh days, it can be filled with people out enjoying the weather.
There has also been renovation recently to do the lower train between 18th and Southside Works / Marina. With two options to go closer to the river or up closer to the train tracks, it makes a great loop option when jogging to get different scenery.
I definitely suggest getting out to enjoy the riverfront trail and enjoy some time in the park on a warm day!