These are my photos from parks I have visited (I didn't take them, they are all from Wikimedia Commons).
This shows you how to make a simple image gallery using articles in com_content.
In each article put a thumbnail image before a "readmore" and the full size image after it. Set the article to Show Intro Text: Hide.
Animals Article Count: 4
Scenery Article Count: 4

Template Support
Excepteur sint occaecat cupidatat non proident, sunt in culpa qui officia

Template Customizations
Deserunt mollit anim id est laborum duis aute irure dolor in reprehenderit

Template Updates
Excepteur sint occaecat cupidatat non proident, sunt in culpa qui officia