A few general tips for any difficulty:
- GA's are generally best served for golden ages, especially with chichen, and even moreso if AI beats you to uffizi, louvre etc. France may be the one exception to this, but I don't play them on Deity.
- There are basically 3 "viable" ways to get tourism en masse: early game through sacred sites (going all piety + ics), spamming arch's midgame and taking artifacts from foreign sites, or beelining for hotels and airports late game.
- As with anything that can incur a diplo penalty, if you make all of your "offenses" on the same turn, i.e. position your archaeologists to start on the same turn within an AI's open borders, you can simply apologize for a single small diplo hit. This strategy also works for settling cities, buying tiles, spreading religion, etc.
- As the above poster mentioned, wonders become less and less viable as you move up from Emperor. The ones I usually try to get are Oracle, Petra (map dep), Chichen, Porcelain, Louvre, and Uffizi.
Specific responses for OP:
1. How do you maintain a decent cultural presence and still be ahead tech-wise?
You can't do both of those. That would require too many wonders, and much time spent building amphi's and opera houses (which are borderline awful as of BNW with only +1CPT). Focus on tech like a SV as others mentioned.
2. How do you find the time to build everything that's required? The guilds and caravans/caravan-related buildings add about 500 hammers to the early build strats. I don't see how I can produce these things: before BNW (in G+K) I wasn't building everything I want, but now I don't even have time to build the things I need.
This is tough to answer, but city placement is really key, as is ensuring that no city will lack hammers. Trade routes are amazing, both for early science and midgame food funneling. The hardest aspect is the possibility of an early DOW; having a neighbor like shaka or rome means you can kiss oracle or chichen goodbye and say hello to spamming composite bowmen. If you can stave off enemy DOW until at least crossbowmen, you should have no problem getting your guilds and caravans/ships online. If there's one thing worth investing in your improvement for any civ game, for any strategy, it's diplomacy and understanding the AI. Very few games are *impossible* to stay 100% peaceful.
3. How do you grow your cities after early warmongering and maintain happiness? The aforementioned is often looked down on in BNW since it sucks more resources than it gives, but I had to do it here with the jungle cities' potential for culture and...
Coliseums, Stone works, circus, and most importantly - lots of gold for CS gifts via trade routes, market/caravanasary. But who and why are you early warmongering? I can't look at your saves at the moment.
sidenotes:
Culture wins can be really tricky on Imm/Deity even when
you do everything right, all it takes is one culture whore(who is also likely the resident wonder whore) to turn a T300 win into a T320 win, even with concert bombs. Diplo can break down at this era due to ideologies, congress, nukes, etc. Siam, Polynesia, Brazil have a track record of doing this to me.
This translates to CV being a risky path to take unless you hedge your bet with some good science BPT + plenty of RA's. It's a shame because CVs are pretty fun to pursue on King or Emperor.