I've had a lot of fun this year keeping mason bees (native bees). They're solitary and extremely docile (I've messed with their comb homes a lot and they've never minded). They're also extremely good pollinators, much better than honey bees.

After an unsuccessful attempt to use a mason bee hive from Costco, I ripped it out and inserted 3D printed equivalents, which they seem to be more interested in. It's also fun that I get to disassemble the nest and double my brood for next year.

As for the garden, it's hard to determine causation, but I've noticed a much better yield on my stone fruits.

I highly recommend mason bees in your garden next year. They're easy, low maintenance, and kids can get into keeping them.