Cramond Island, located off the coast of Edinburgh in Scotland, is a cool tidal island that you can walk to when the tide is low. It's about 1⁄3 mile long and used to be a Roman outpost back in the day. Nowadays, it's a popular spot for a stroll or a picnic, but watch out for the rising tide – you don't want to get stuck there like a modern-day Robinson Crusoe! Just make sure to check the safe crossing times and enjoy the adventure on this historic little island.