ok, agricultural + industrious seems like the 2 best traits, at least on monarch difficulty. i couldn't fathom just how a +1 food on your city square would do much of anything, but it really helps, and also you don't have a dead city with a bunch of desert tiles, as long as you can irrigate it, you get an extra +1.
i chose the mayans on pangea. didn't bother researching monarchy, researched republic faster than usually for me, and waited just a bit until i have a few 7 size cities or close to 7 size cities.
changed to republic, adviser says it will take 6 turns.
sidenote: i kind of assumed that you accrue culture points even while in anarchy, but i checked 1 of my cities and it didn't accrue anything during that time.
i half assed tried to get to my golden age with my javelin thrower unique unit (2/2/1) while i was in republic and in war, but i was fighting swordsman and spearman inside their city, was close to killing a straggler then decided it was a futile endeavor.
so i haven't gotten to my golden age yet, but i am moderately ahead technology wise and army wise. im in early industrious period while everyone else is still stuck in late middle age, lulz.. i also have a pretty decent culture lead, and my neighbors cities was overthrown to me, i believe 3 times.
at this stage of the game, i pretty much won, but sometimes in fun pummeling the AI with my cavalry/cannons with their musketeers. XD
ps: what is GTP?? i think i know what it is i just don't know what it stands for and google failed me. it has something to do with the cost of 1 military unit in gold if you are above your allowed units??