Originally Posted by UKtravelbear

What sort of tour? What are your interests?

There are several available on the likes of Expedia that cover a number of areas of interest.

The Visit Berlin website is a good source of info on things to do etc

https://www.visitberlin.de/en

Originally Posted by notquiteaff

All the museums of the Museum Insel if that’s your kind of thing.

It’s a bit cheesy, perhaps, but I actually like to do the hop on, hop off bus on my first day in a major new city, especially if I am tired from traveling for 10+ hrs. Just to get a feeling for the place. I did that years ago in Berlin.