Ideas for Gothenburg

Hi, we are a couple in our 50's cruising the Baltics with RCL on Jewel of the Seas in Aug, wonderd if anyone had ideas or recommendations about what to do in the ports-Mainly Gothenburg.

We visit Copenhagen, Stockholm, Helsinski, St Petersburg, Tallinn and Gothenburg. We know we have to book a tour in St Petersburg but any ideas would be welcome.

Also any idea what the weather may be like at that time of year!

i had a few suggestions in this thread:

http://boards.cruisecritic.com/showpost.php?p=34168239&postcount=8

Not sure if the East Indiamen Götheborg will be in or away on tour. If its in it might be worth a visit.