Traveling from Xuzhou to Qingdao, I mainly want to go to the polar ocean world and the beach.

If you only look at these two scenic spots, three days is more than enough.

Tickets for the polar regions can be bought online, which is cheaper. Taobao has, polar ticket booth to collect tickets and online payment.

The train station has to go out for some distance before taking a taxi. If a taxi stops near the railway station and asks where you are going, ignore them. These are carpooling or cheating.

Accommodation I think it's good near Zhanshan, which is close to the urban area. You can walk to Badaguan Beach. I went for a stroll in the evening.

Your schedule is more relaxed. If you change your mind to go to Laoshan temporarily, don't join the one-day tour. Because they often let you travel long distances to Laoshan Mountain, only give you an hour to climb the mountain, and you leave without seeing anything.