I wonder what your priorities were Vybik? and the places in the Modern Antiquarian are a very good start, just make sure you get to the Ring of Brodger, Stenness and Maeshowe, then after that i'd go for Wideford Hill, The Fairy Knowe, Unstan, Skara Brae and the tomb of the eagles and then anything else you've got time for, we were in a campervan and always sleep wherever we are on the night, it's very viking on there so you can pretty much sleep where you like.