Translation:What do you want to do during the winter holidays?
Dear Duolingo staff, Duolingo is the best language learning tool I know of...but this "holiday" needs to be corrected. Native English speakers do not say "holiday" the way it is translated here. "What do you want/plan to do during the winter break?" If you really want the lessons to teach the word "holidays", then just allow, "What do you want/plan to do during the holiday(s)?" Native English speakers will just leave out "winter/summer" in this case, as which break/holiday it is will be understood in the context of the conversation.
I've been a native English speaker for fifty years and I would say "winter holiday", "winter holidays", "winter vacation", or "winter vacations", etc. They all sound find to me.
I don't know if it has anything to do with growing up in Australia where our winter break is some time around June/July/August, or if it's something else.