Firstly, 5-6 cities can be Wide OR Tall, it just depends on how you time it and manage it. Tall can have 6 cities, but you'd likely want your National College at 2-3 cities before planting the rest of them. For Wide, 5-6 cities is (IMO) too few cities LOL. But then, when I play wide, I spam every inch of land I can find. I could easily see this as a Tall game for you, with 4 cities, maybe more if you feel itchy to expand...but I can see why you'd want Liberty for that free settler and settler production if you want to spread out quickly.
Blue, Orange, Green, Dark Red. My reasoning:
Blue first. Dark Red is a good spot and the Salt will be nice, but no one is contending against you for that spot so you can do that later. I would prioritize the two natural wonders. As Poland, I think the culture of Mt. Fuji slightly is less important than the Faith+Happiness+Food of Sri Prada (and as a one pop city it sustains itself with growth/food right away). Blue, with Prada, 2 Stone (& 3 hills), 1 Pearl, 1 Fish, an extra Cotton and Cattle later...that's #1 for me. that's a really good city, IMO. Hopefully this will get you first or second religion as well, and if you take Natural Wonder Faith as your Pantheon, that would be pretty strong.
Up north I like the Orange spot next. I don't love all the jungle and no luxes. But the happiness from Prada in the south will help ease that a bit. I don't love the Orange spot, but could see that being #2 if Fuji feels like a good get for you.
Green is #3 for the Marble. Or #2 if you prefer and make Fuji #3.
I would go Dark Red as #4 (maybe after National College) for the Salt and good growth. I can see why you might prefer the lighter red spot next to the river and that's fine. But it crowds your Prada city a bit, and the Dark Red might have a shot at those eastern horses for a Circus, which will also help with Happiness (wide or tall) if you Cap borders don't hog both Horse tiles.
Unless you're going very for a very wide sacred sites type of game, I would ignore the Yellow and Pink locations.