My question is about page address URL or permalink. I use Atahualpa theme for my website www.smartvacationideas.com, which assigns a default permalink to each page. For example, the page "Cruises" has a default permalink http://smartvacationideas.com/?page_id=55 . The "Cruises" child page "Alaska Cruises" has default permalink http://smartvacationideas.com/?page_id=220 . Is it better for search engine visibility to change the pages' permalinks correspondingly: http://www.smartvacationideas.com/cruises and http://www.smartvacationideas.com/cruises/alaska ?