I spent about 2-hours exploring every inch of Suramar city and outdoor locations. I found countless amount of content: treasure chests, Vignettes, Elite rare bosses, demons, Nightborne, and even deep sea content on the east coast of Suramar (Jandvik) which is occupied by the naga forces.
Suramar is even bigger than what one actually sees in the map, and I think this is the first time that Blizzard adds a zone that has so much underground content.
The western Suramar area, Falanaar, feels like Azjol-Nerub — the underground zone we never got to see in whole in Northrend. Falanaar has a huge ancient underground catacombs filled with Nerubian-Nightborne hybrids and spiders.
Felsoul Hold has various caverns and catacombs filled with demons, and ghosts. Many of these mobs are elite. These areas are definitely not for the faint of heart, and I wouldn’t recomment running through — aggroing a train of mobs.
Suramar City is vast in size and beautiful. Took me nearly an hour to explore the city and I likely missed a few spots. The city is immense considering it also has a catacombs beneath, filled with Nightborne, and also a second floor high above. Lots and lots of ground to explore.
The first quest for Suramar seems to be at Moonguard Stronghold. That’s the only one I could find. That area has been invaded by Nightborne. Not far from that area you can also find Harpies.
Suramar Exploration Video