Travel Currency

We are off to San Francisco tomorrow, to visit my daughter & family. It was planned as a holiday, but we seem to be carrying out babysitting duties for our 3 year old Granddaughter. I'm sure it will be fun, but we may be glad to return home for peace & quiet.
Whilst away we may have access to blip & the internet so may be able to keep up with some journals. If not we will look forward to catching up with everyone, when we return.
Have to say that these US dollars all look very similar in size, colour & design............