There are a couple of tent hotels in Deosai. One at Bara Pani and one at Sheosar Lake. Or you can rent equipment from Skardu and pitch your own tents. But be careful of 2 things. The weather at night will be very cold so keep warm clothes with you. Secondly, talk to locals about possibility of encounter with bears at your campsite. They can smell food from great distance and could think about joining you for dinner
Apart from this you can go to Shigar, Lower Kachura, Upper Kachura, Manthoka Falls, Khaplu, Kharpocho fort, etc during your trip. Rama Lake is also an option.