Andrew,
If you go RVing, try to make it up here to the UP of Michigan. It is one of the most beautiful places in the lower 48. From what I've seen, the landscape isn't that different than New Zealand. We have more lakes per capata than anywhere else in the country, and some beautiful water falls. Just make sure you come after May, because otherwise there may still be snow on the ground. Unless you like snow. My baby will still be very young, but a play date with an older grey might be fun.
- Hannah
ps. Sorry if I sounded like a travel agent. Hehehe.