Floria embankment, Marmaraya metro stop - Aquafloria (not Floria itself) entrance to the embankment through the shopping center. Beautiful embankment. I've been there a couple of times and I'll stop by when I arrive. Atatürk airport is nearby. Planes are flying very low for landing/take-off. There are a lot of seals, benches for relaxation. Bolshaya Kamennaya embankment, towards the Yoshilkeya metro station with sand, you can dip your feet) There are excellent cafes, local yachts, separate clean toilets (payment is a couple of liras).
The park is large, green, clean, and there are "restrooms" on the territory. You can enter them through the turnstile by attaching an Istanbul travel card. There are playgrounds! The lawns are well-groomed -mowed. People bring bedding, tables, arrange picnics, relax. The park is located on the shore of the Marmara Sea, from it you can admire the ships on the raid, there are countless of them! The beach is open in summer. There were no photos of the park itself, but there is a small video.