Annise hyssop, mint, borage, gillardia... Go to your local nursery and see what the bees are all over and plant it.
Since it's for the kids, I have to suggest that you get some bees of your own. It is a great passtime for the kids.

Awesome! We just sowed seed for annise hyssop & gillardia, We tried them last year in our garden & didn't have any luck with the germination but this year a few came up! Thanks!

cpp6318_ interesting suggestion, where could I get bees?

Anything that's a nectar plant for butterflies, and has a short flower stem is fair game. your county ag center should have a list of bee friendly plants for you, too.

Crepe myrtle, cassia, gallardia (as mentioned) milkweed, porterweed, citrus, zinnia, bee balm, palm trees, all work. Spanish needle, portulaca...I've seen our bees on our roses...

Do you want to see bees or to keep bees?
If you want to see bees, place a shallow plate of 2parts sugar and one part water outside. You'll see bees. Foraging bees tend not to be defensive, so you can USUALLY observe them safely. If they buzz you, walk away. MTCW.

If you wantt o keep bees, get in touch with your local beekeepers association and take some classes. A cold start has a steep learning curve...and can be expensive.

1. Good for you! It is great to garden for bees and even better to do it with the next generation! Here are some resources you might find helpful
2. https://www.charlottesvillefamily.com/growing-greens-all-winter/
3. https://www.charlottesvillefamily.com/gardening-with-kids/