Fun ideas for Stockholm?

I will visit one of the Scandinavian lands, Sweden and its capitol city Stockholm this year. I am still not sure in which time of year I will finally make that trip come true, but I guess one thing is for sure not going in winter time, wonder why, heh. Considering that I am not familiar with what this city could offer to me, and I am looking for fan places, any fun ideas I could get in here?

One tip, prepare a bag of money Sweden is expensive country. I think boat trips outside of town and seeing museums, considering the fact that Stockholm is full of them, could be a fun ways to waste some time. The Vasa as most praised museum in Stockholm and taking a walk through Gamla Stan the old city on the Stadsholmen Island in the center of this town are highly recommended. If you manage to get out of your system that fear of cold weather or you want to see and experience literally meaning of the expression on the rocks, then order your drink in the Ice Bar placed in Nordic Sea Hotel and you will get it served in the ice cube. Staying cool and calm in this bar shouldnt be a problem, just be aware not to freeze.