The iPad is a great device but one size definitely doesn't fit all when it comes to fonts. Here's how you can change the font size and also turn on the screen zoom on your iPad.
1. Go to Settings, then General then Accessibility.
2. Click on Large Text in the Accessibility settings and choose the size of the text you want. Note that is applies only to Contacts, Mail and Notes.
3. Go back to the Accessibility settings and click on Zoom to turn on Zoom.
That's it. Now you have the font size you're most comfortable with and you have zoom to make it easier to see things on your screen.
iPad tips - change the font size and activate the screen-zoom! | iPadappsnorge