Children love the idea of going in a tunnel under the Mersey and crossing over on a boat. Park at Hamilton Square in Birkenhead, get the ferry to Liverpool (superb, heartbreakingly lovely view) and, after a stroll, picnic and visit to the Albert Dock, get the train back from James Street station. Steep escalators, lifts and friendly station staff. Cheap and good fun.
Hamilton Square is signposted from central Birkenhead and is itself an interesting area. The ferry is a five-minute stroll downhill from the station. Ask if you're not sure.
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