Make the shore the shared activity
Tell the group that swimming isn't part of the shared plan. Choose a meal, a short permitted walk or time sitting together as the main activity. This makes the outing clear for people who don't swim or simply don't want to.
Don't assume everyone is waiting for encouragement to enter the water.
Choose comfort over extra activities
Confirm seating, shade and toilets at the venue. Ask how far the parking or drop-off point is from the area you'll use. A long walk through sand may not suit every guest.
Bring a book, a simple game or a conversation prompt if that fits the group. Check venue rules before using sports equipment or speakers.
Give the visit a clear rhythm
Arrive, settle, walk if people want to, then share a meal. Keep the return time visible so nobody has to interrupt a relaxed afternoon to negotiate transport.
A place such as Brenu Akyinim Beach can be considered for this kind of outing, with facilities confirmed separately. Choose the setting because you want time by the sea, not because a beach day supposedly requires the same activities for everyone.
Rules, fees and opening hours change. Confirm anything that matters before you rely on it.