A lot of things have been covered here already!

Uhh, I think you can get fast passes and such on some rides using your ticket. I forget exactly, but there will be a time stamp telling you when to go back to that ride and it will be much faster to get on so you don't have to get stuck behind a colossal amount of people. Lines are reeeallllyyyy big down in Disneyland.

Space Mountain's fun. Splash Mountain's fun. Matterhorn was pretty solid if I'm remembering it correctly. Splash and Matterhorn have some water splash so uh, yeah be careful with that lol. That is if you get on. But yeah, these are popular rides so definitely hit them early before the yyyyuuuuuuggggeeee lines of people begin hoarding up. Theme of the day is big lines, kids.

If you're going there and staying into the night, the Fantasmic show is pretty cool alongside the fireworks and all that. Enjoy your time there. It's pretty fun, also a lot of things not to like but overall I've enjoyed the two whole times I've been there.