Do you own a smart phone? If so, have you checked with your local carrier about a short term data plan in the US? Google maps is outstanding and does not use much data. Also, you can download maps onto your phone while using WIFI in the hotel and then Google maps will work on those maps in off-line mode. I recently used Google maps extensively in England for a week and only used about 50 megabytes of data ( I was actually a little bummed because I had pre-paid for 300 megabytes ).