what to do in oslo?

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Hi everyone! I'm off to Oslo in a week's time for 4 days and was wondering if anyone can recommend things to do and see. At the moment, I'm pretty snowed under with work, so can't really do much research myself and as I'm only going for a few days, I don't want to spend the time umming and arghing over what to do, so any recommendations would be really grateful. thanks!