I have found that the best starts for Brazil are with a capital with good initial production with jungle nearby for other cities, rather than packed right next to the capital itself. Some jungle near the capital, esp in the outer cultural ring, is OK, but it's better to have some early hammer via production tiles in the first two rings.
I won my first cultural game on turn 310 as Brazil. Chichen Itza is critical obviously, as is the policy that lengthens golden ages. You'll want the Taj Mahal too, and it's best to use your last few artists on golden ages, rather than building great works. It's pretty easy to get several dozen consecutive turn of golden ages for your endgame.
It will be a challenge to figure out the right balance of great works from artists to max out themeing bonuses vs. using them for golden ages at the end. Also, it will take practice to learn how to time your golden ages for maximum effect. I am still learning.
Yes. Chichen Itza is the only wonder I try to get early in the game. So in my immortal continent plus game, I chose Liberty and expand 2 good production cities before NC. Keep growing the 2 small cities and stay happy. Going to Bronze working instead of construction for proper defence. Then a few lux tech before Philosophy.
Then going to civil service, took Drama before other techs if you want to expand another 3 cities to make a total of 6. Otherwise, tech rate to civil service is important at this point, so keep growing capital and build some essential infrastructures and a few archers.for.upgrade later.
After that, go Metal Casting, then Machinery. Assign an engineer in capital for a GE. Then Education, Printing Press. During that time, also work two writer specialists and open Aesthetics. Build one of the Pizza Wonder or Global Theather but rush the other using the GE. Rush Sistine Chapal with another GE from Pizza or if gone going for Uffizi instead.
Timing of GAMW birth era is super important, this is especially true for GA. Plan ahead and get
Two GW in the same era for GT (easy)
Two GA in the same era for SC (medium)
Three GA in the same era for Uffizi (hard but time the social policy that gives free GA)
Three GM in the moden era for Broadway (try to avoid building music guild before modern)
Going Industrialisation first then choose Freedom quickly.
Then going Scientific theory then electricity, use Oxford to bulb into Modern era very quickly.
At this point fill the rest tech tree, then go hotel and airport.
With this build, your defense is solid with archery units. And play diplomacy carefully and bribe AIs to war.