A green canyon tour Antalya search usually means a day on calm, green-tinted water with swimming and a meal, and the canyon itself is a reservoir in the Manavgat area, east of the city. It is a fair drive from Antalya, so it makes a long day whichever way you go.
The TurB2C list for Antalya has no Green Canyon departure at the moment. What it does have is a boat day from the city: the Suluada Island cruise with lunch and hotel transfer. This page helps you decide whether that fits what you had in mind.
The Green Canyon is a mountain-lake setting: forested slopes, still water and a sheltered ride. That suits travellers who like scenery more than swimming. The Suluada cruise is a sea day. It is about the Mediterranean, rocky coves and time in the water. If your group wants to jump in, float and lie on deck, the island cruise matches that better. If the main draw is the canyon scenery, this tour is a different thing.
The cruise lasts 7.5 hours, so think of it as a full day rather than an outing. Lunch is served on board, which means no hunting for a restaurant with tired children or a partner who is already hungry. The boat itself offers a place to simply relax between swims. Those who prefer to stay dry can stay on the boat, while others swim at the stops. Bring sun protection and a towel, and wear something you can swim in.
The Green Canyon needs a long road transfer from Antalya before any boat is involved. The Suluada cruise sorts out the logistics differently. The listing includes hotel pickup and drop-off, so you are not working out how to reach a harbour on your own. - Boat cruise to Suluada Island - Several swimming stops in clear Mediterranean water - Lunch on board - Time to explore the island's rocky landscapes and coves