Photoshop’s Own Slideshow
If you don’t want to create a full PDF Presentation, you can create a mini slide show right within Photoshop. Just open all the images you want in your slide show, then Shift-click on the Full Screen Mode icon near the bottom of the Toolbox (it’s the third icon from the left), and press the Tab key on your keyboard. To step through your slide show, press Control-Tab.