MSC Preziosa Cruise: Independent excursion to Stonehenge

Hello, We’re taking a cruise to Northern Europe with a stop in SOUTHAMPTON. We’d like to visit the Stonehenge site. Is it possible to get there on our own (my husband is a wheelchair user), since the MSC excursion to Salisbury is priced at 127 € per person? There’s also a stop in Rotterdam, and it seems there’s a "miniature village to visit" nearby. Has anyone here been there, and if so, how did you get there? Thanks so much for your tips. Mum49