Here's a link to the one I used: http://itunes.apple.com/us/app/my-maps/id321930101?mt=8

It's by Ruths Research and Design.
There may be better apps out there, but I thought for $1.99 it was worth it to be able to access all of my places on googlemaps info as well as the photos of the front door that I have in the notes for most places.
On a side note, if you can rent a local iPhone 4 with unlimited data for as much as a mifi then I would go for that and you can still use this app or regular old googlemaps. I so wish I were heading there!