I walked the entire path from the Mercado de Mariscos/Old City to the end close to Paitilla. It was a nice welcome to have a wide (if not huge) path all perfectly paved with interlock bricks and greenspace along the waters edge.
It was nice watching the traffic jam along Balboa which runs alongside. Nicely afar from the path so you can get away from the exhaust for a bit. Views looking all ways are beautiful.
Totally uncrowded. Along the way there are a couple vendors selling cold drinks and snacks. There is a small water park with a couple jets for kids to play in. Metal benches all along the way (you're gonna get a bit tired with the sun). Saw a couple outdoor work out machines.
Didn't find any washrooms however...