Had a look at the save. First thing I noticed, is that two cities are actually rioting. That should really not be happening! Did you overlook that, Splunge? Your lux slider is at 20, so I presume you put it there a bit earlier on to prevent this from happening. Put it at 30, and Paris and Rheims are not rioting anymore.
Another way to deal with rioting cities is to open up the city screen. If you then click on a worked tile, a citizen will turn into an entertainer, and the town will become a bit happier. You can click on the entertainer to turn it into a taxman or scientist. Sometimes this is already enough to get rid of some unhappiness, and you're better of with one of those guys than with an entertainer. A taxman gives you two uncorrupted gold coins per turn, a scientist gives you three science beakers.
Sorry if I'm mentioning things you already knew, but I'm sure that at least I didn't know all of this when I was playing my second game!
There's a good program on this civfanatics site, called Civassist two, to be found in the utility programs section, that can help you managing your game. It will warn you when a town is about to riot, and it will notify you when a new tech has become available for trade. It gives lots of other information as well; it's really handy!
I've seen you before on this site, Splunge, and would encourage you to keep reading these pages. Still some basic mistakes can be found in your tactics, but you're probably progressing fine. I think I'll leave it to others to respond to the tactics...
Edit: Nobody responded yet? Ok, my two cents worth then:
- Build barracks first in towns where you're gonna produce lots of military units. You can really use that extra hitpoint!
- Try not to let your units become isolated. You've got a few units next to Kyoto that are left vulnerable. If you can't mobilize the kind of stack that can take a city, it's better to stay out of enemy territory altogether, unless it's for pilliging. Attacking stray enemy units usually leads to your own units getting counter attacked by the enemy, and you end up just losing units.
- Build more attacking units instead of defensive units. Even for the defense of your own territory you're better off with catapults and archers than with spearmen. It makes you strike first, which is better.
- Lyon (for some reason Firaxis spelt it as Lyons) should have been built on the river. That would have saved you building an aqueduct. I think I would have planted it one tile closer to Paris, that would have left space for one more town on the river, north of Lyon, on the hill. Your city spacing is quite wide, but that in itself isn't wrong.
I think these are the main things I'm seeing. Thanks for showing the save!