You would have to make the landscape page the last one, as far as I know. At the top, click on Page Setup. In the bottom right corner there is a little arrow. Click on that, and it pops up with a window. Change the orientation from portrait to landscape, and then at the bottom of the window, change 'Apply to' to 'this point forward' as opposed to 'whole document'.
To change the orientation on only one page, select the page right before the page that you want in landscape on your document click on Page Layout. Click on Breaks and hen select Next Page from the drop-down menu under Section Breaks. Now choose the orientation you want on the selected page. You can check out http://www.online-tech-tips.com/ms-office-tips/make-one-page-landscape-in-word/ for more instructions.