I'll try to answer some of your questions:
-Ramesess peace deal, should you take tech and let him live for another 10 turns?
Depends. Can you get the same tech via trade anyway? Does calendar/HBR have trade value? It also causes unhappiness in his ex-cities, which will be gone when he is knocked out of the game. Also, note that getting techs in peace deals counts towards trade limit (WFYABTA), which shouldn't be a big deal though. So all in all, very situational and requires some experience to understand the pros and cons.
-courthouses or just build wealth?
Depends. Since you have so many cities, maybe you can just keep capturing more and win the game? Once you have a clear vision on when you will wrap the game up, it becomes much more easier to see whether a building is worth it. In general, I don't build courthouses when going for domination wins. It doesn't matter if a city is costing 13
per turn, if it is working good tiles such as cottages.
-golden age, when?
When your empire is ready for it. What you need is
- the guy who will start the golden age
- philo (access to pacifism to be exact)
- several big (over size 10 at least) cities that will run specialists
- religion spread to at least to your biggest cities to make use of pacifism
This is to take max use of all the
-bonuses. There can be other reasons to start a golden age, like if you happen to spawn several GP of a weaker type. Artist and priest are nearly always weak, engineer and spy are situational, merchant and scientist nearly always excellent.
-city management
kwaDukuza: coastal with no seafood, grass cow, some green tiles. I wouldn't build a lighthouse even, it just adds marginally useful tiles and costs 60
. You can use this city to whip workers/settlers or build wealth. Not strong enough to build buildings IMO. Maybe you can also use it as a weak unit pump, since there is a settled GG.
Bulawayo: perhaps you shoul've razed this one. Without
cities are very weak. Definitely too weak city for a library. Just find a way to get border pop (missionary?) and improve the dry rice, then grow on cottages.
Memphis: has Mids and ToA I think? A decent city to run specialists in during the golden age. Grow.
uMgung: what to do with green hills? Typically ignore. Low priority like Fippy noted.