Roald Dahl
Magic Treehouse

The Tony Abbott books -- Droon -- easier reading level, but my ds ate them up in early elementary (1-2 a day, and luckily there are lots of them)

The cats series books -- Warriors, I think they're called. Sounds militaristic but is quite sweet and G-rated

Guardians of Ga'hoole (don't know if I have the apostrophe in the right place!)

Little House on the Prairie books