Verizon it is then! Will the SIM work ok in my iPad as Night Spring says there may be issues? Also is it like AT&T where I can just walk into any store and pick their SIM up?
From what I understand, all International iPads are of the AT&T variety, and therefore you need to get an AT&T microsim. Verizon iPads are only available in the US.
Would be worthwhile checking out AT&T's website to locate a store close to your hotel.
The fall back from AT&T 4G is naturally AT&T's 3G service. My first hand experience with AT&T 3G's service was adequate to abysmal at times. It really depends on location. I was in NY last year using my iPad2. I'm planning another trip next year and would be using the new iPad.
But 3GB for $30 should easily last you a week or more. But if you get some good LTE speeds, then better monitor your usage. I used about 500 Mb the week I was there and a good chunk of that was because I forgot to turn on WiFi when I was back in my room.
Free WiFi is also available at Starbucks and MacDonalds. The 5th Ave Apple store has great WiFi speeds. I just couldn't handle the crowds when I got down and quickly left.
FYI, you can cancel your 30 day plan on the last day you are there and still use the data. When you 'cancel' what you are doing is ensuring that another charge of $30 won't be deducted form your CC at the end of 30 days.
I have waited to cancel when I returned to Canada on WiFi with no issues.