Need your advise for the Northern Europe trip. thanks

we are going to northern europe next month for one and half month, around tickets from Honolulu to London. I would like to visit London, Ireland(Dublin), Iceland(Reykjavik), Norway(Oslo), Sweden(Stockholm), Damark(Copenhagen), Netherland(Amsterdam),Germany(Berlin), Austria(Vienna).

But my hu*****and said we should not go to Irend, Sweden, Denmark, and Germany this trip.I know the trip will be more relax if do not visit so many contries at once.

We need your advise please.

Thank you in advance.