Hi- I'm from Arizona, though I've spent relatively little time in that part of the state.

Northern Arizona can still be pretty cool in early April- when do you plan your trip? If you want to see wildflowers, birds etc I would suggest coming in late April.


Here is some info about Petrified Forest:
http://www.americansouthwest.net/arizona/petrified_forest/national_park.html

Actually, the main part of that site had great links to many other interesting areas to visit- so you might want to check this out:

http://www.americansouthwest.net/arizona/index.shtml