I would call the beach authorities, they should be able to help!!
much safer to do it this way than potentially get it wrong.....
........although it's meant to be a nice beach to ride on (not done it myself) it is still dangerous at times, and a horse from our yard unfortunately died here a few years ago.
you need a tide timetable. Aim to go on beach before low tide time as tide is going outThis should give you a good few hours. Make sure you come in before tide starts to come in. Be careful of hidden channels