For the anime, is there a particular genre of movie that you and your wife both like? Maybe try to find one there or try to find a universally loved show (maybe Angel Beats! ?).
A simple way to start a blog would be to make a wordpress. It's free and fairly easy to customize the appearance through template themes and understandable menus. It might be somewhat difficult to get a hang of, but once you know it's great. You can just do a daily reflection for 5 minutes or, as it would seem you are a write, try to do a writing challenge everyday.
N64 games are up to you. I hope one of those games isn't Glover, as even I haven't been able to beat it going back 15 years after I first tried it.
Creating a video game could be done through GameMaker. It's mostly drag and drop "coding," but there's also a simple language behind it from what I understand. I made a decent side-scrolling "Metroid" game once, where bosses included Charizard, Master Chief, Deoxys, and an Omega Metroid, and it didn't take that long (not a super long game but still decent). Gamemaker comes free but there is a pro version with more features.
Publishing and writing the books are up to you, but I wish you well and if you need someone to proofread for anything (typos, plot, character coherence, etc), there's probably many people here to help including me if you'd like.
Overall, best of luck with this list and also let your wife know about it. She would probably be supportive of this and would make everything much more doable :3