Can you recommend something interesting around Portland? We will be stopping there for the day on a cruise ship. Thank you.
Portland castle: https://en.wikipedia.org/wiki/Portland_Castle
http://www.english-heritage.org.uk/visit/places/portland-castle/
I've never heard of the Isle of Portland being a cruise port, but it does have a humongous former navy harbour.
Portland could be the landing place because it has deeper water than nearby Weymouth - which has an extensive sandy beach.https://www.visit-dorset.com/explore/areas-to-visit/weymouth-and-portland
It is in the county of Dorset - which has loads of interesting places but how you get to them from your landing point is another matter.https://www.visit-dorset.com
https://abbotsbury-tourism.co.uk/gardens/
www.jurassiccoast.org