* Read everyday. It's hard in the beginning because they lose interest easily, but consistency is key.
* Always keep things interesting for them. This is hard because there will definitely be activities you want to do but the kids will find boring or too difficult.
* When they get older, at least 5 years old, start a sport. I've been taking my kids to judo. It takes a ton of time for me, but I know it will do them good if they keep at it. I grew up practicing judo, so that helps.
* We've watched many anime series together. Definitely watch "Avatar the Last Airbender" and "One Piece."
* I'm a gamer, so we've played a lot of games together: Minecraft (of course), Mario 3D World (on Switch), Castle Crashers, Minecraft Dungeons, and other co-op beat-em-ups.
I honestly don't know if it's the most valuable things to do because my kids are still young. I have 4 now, but I believe always finding time to spend with them and have things to talk about is most important no matter what it is.
I always liked this advice: Don't give the things you've never had, teach them the things you didn't know when you were young.