This may not help you and I have no idea how much you pay for your dumbphone service but I going to put this info here anyway - someone else might benefit.
You can buy a prepaid Verizon smartphone and sign up for their new $45/month ALLSET plan that gives you unlimited talk & text and 500 MB of data.
The best thing with this new plan is that your phone also becomes a Mobile Hotspot that can share data with up to 5 compatible devices.
After you've signed up for Verizon's ALLSET plan you have the option to add data with bridge data:
$5/500 MB good for 30 days
$10/1 GB good for 90 days
$20/3 GB good for 90 days
500 MB is more than enough for reading email, browsing online, google maps, glympse, etc.
I used to carry a MiFi - one with T-Mobile and one with Virgin and the coverage was absolutely horrible compared to Verizon which, imo, has the best coverage of all the carriers.
I also paid more just for crappy coverage with those MiFis - no phone, talk, text.
There's no way way you're going to be able to stream with a mifi or hot spot so download your movies and music to your device(s) before you leave.
This is the phone I have and I love it.
4.5" screen Android
LG Exceed 2 phone - $50 from Best Buy with free shipping
BTW, the same phone is $80 from Verizon and at Walmart.
Here's the scoop from Verizon
Verizon AllSET $45/month unlinited talk & text and 500 MB Data