Page And Thumbnails view and Thumbnails view are handy because they offer a simple way to navigate from one page to another in a multipage document. Clicking a thumbnail in Page And Thumbnails view changes the current page to that of the selected image. Double-clicking an image in Thumbnails view presents the selected image in One Page view.
You can also get around without the thumbnails, however, by choosing commands from the Page menu. Next and Previous let you move forward or back a page at a time, First and Last take you to the first page and last page, respectively, and Go To lets you hop to a specific page. Go Back takes you to the page you were looking at last.
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Ctrl+Page Down and Ctrl+Page Up are shortcut keys for the Page menu's Next and Previous commands.