If you only have 2-3 hours to spend in Ely, there are a few things you can see and do to make the most of your time:
One of the most iconic landmarks in Ely is the Ely Cathedral. It's a beautiful historic church that has been around since the 11th century. You can explore the inside of the cathedral and marvel at the architecture and stained glass windows. It typically takes about an hour to walk through the cathedral.
A historic house turned museum, Oliver Cromwell's House, is another interesting place to visit while in Ely. It's the former residence of Oliver Cromwell and showcases his life and role in English history. You can spend about an hour touring the house and learning more about Cromwell's life.
If you're interested in the history of Ely and the surrounding area, then a visit to the Ely Museum is a must. The museum has exhibits that showcase the history of the area from prehistoric times to the present. It typically takes about an hour to go through the museum.
If you're looking for some fresh air and a bit of exercise, then take a walk along the Riverside Walk. The path runs alongside the River Great Ouse and offers beautiful views of the river and nearby countryside. You can take a leisurely stroll for as long as you'd like.
Overall, you can see and do a lot in Ely in just a few hours. Depending on your interests, you can visit one or all of these attractions during your time in town.