Welcome to the board, Nola!
I do not homeschool, but there are many new friends online here that do.
Here are my thoughts:
Going to the library 1st will give all of your children an idea of what is planned for your visits. What about using websites of the location you are visiting?
Other ideas: everywhere you go there will be brochures available.
Make a scrapbook with them. You'll need 2 of every brochure for use
in the front and the back.
It will give you time to review where you have been and what you saw.
You could also add comments from each of the children.
This could perhaps include English,
communication skills,
handwriting skills,
geography,
history,
the weather,
the alphabet,
numbers & letters.
For the little ones, maybe even some baby sign language.
On regular vacations, we always made a point to stop at museums,
zoos,
historical places,
state parks.
One incidental side trip in Florida, we stopped at Homossasas Springs
and learned all about manatees. We got to see them up close in their
natural habitat and learned so much. This is one side trip, the boys
talk about even 12 years later. My sons brought up this trip again
this weekend. They do not recall much of the rest of our expensive
FL vacation.....but they distinctly remember the manatees!
You will be making wonderful memories with your children. Take photos!
Your children have allready been exposed to culture, art, & history in a
wonderful way with the best teacher possible - you!