i'm writing a dungeons and dragons campaign for a couple of friends, given the description of the hellbound city of Dis, could you come up with a couple of cool activities my players could do once they get there? remember that having fun and seeing cool things is the main focus, no matter how serious or absurd a situation can get.

The City of Dis is incredibly massive. The walls, buildings, and other structures clutter the immense black metropolis and glow at the edges like heated glass. The city is a broken maze of metal ramparts built into miles of steep hillsides and shattered towers framing an endless labyrinth of twisting alleyways.
The air is extremely hot and distorts with the heat as smoke rises from the streets themselves, with the occasional ash or ember drifting through the air.
Most of the buildings are built out of dark stone, climbing for many stories. The architecture is hooked to the corner as the monolithic deep reds, blacks, and grays, nothing belies an exterior that would seem to be welcoming to a traveling pack of people. At the center, visible everywhere in the city, is the Iron Tower, an impossibly colossal and unreachable tower of black iron and lead that stretches for hundreds of miles into the sky before vanishing into the dark, clouded expanse. The Iron Tower is the throne of the archdevil Dispater and stands ever-vigilant over his Iron City of Dis.
The city of Dis is always changing and being rebuilt in accordance with the decree of paranoid Dispater.
1. Exploring the Twisted Alleyways: The city is a maze of twisting alleyways and the players can spend hours exploring and discovering the hidden secrets and treasures within.

2. Visiting the Marketplaces: The city of Dis is known for its vast marketplaces where players can barter for goods and services, as well as meet new and interesting characters.

3. Ascending the Iron Tower: The Iron Tower is a massive and imposing structure that reaches high into the sky. The players can try to reach the top, facing challenges and obstacles along the way.

4. Bargaining with the Demons: The city of Dis is home to many powerful demons and the players can try to make deals or negotiate with them.

5. Surviving the Pit Fights: The city is famous for its pit fights where players can participate or simply watch the brutal battles.

6. Robbing the Hellish Banks: The city is home to many banks and the players can try to rob them, facing the consequences of their actions if caught.

7. Visiting the Baths of Dis: The city is known for its hot springs and the players can relax and rejuvenate in the Baths of Dis.

8. Gambling in the Casino of Dis: The city is also home to a famous casino where players can gamble and win (or lose) large amounts of money.

9. Discovering the Secrets of the Iron Tower: The Iron Tower is full of mysteries and the players can try to uncover its secrets, facing the wrath of Dispater if they fail.

10. Experiencing the Nightlife: The city of Dis is known for its wild and exciting nightlife, where players can party, dance, and revel in the devilish delights of the city.
Come up with interesting allies and villains unique to this city.
Allies:
- The Infernal Bureaucrat: A neutral but organized and efficient demon who can help the players navigate the maze of bureaucracy and red tape in the city.
- The Smuggler King: A cunning and resourceful individual who runs a secret network of smugglers and can provide the players with goods and information that are hard to find in the city.
- The Pit Fighter Champion: A powerful and respected fighter who can help the players participate in the pit fights and offer protection in the dangerous arenas.
- The Casino Magnate: A wealthy and influential individual who runs one of the largest casinos in the city and can offer the players a chance to win big or help them out of trouble.

Villains:
- The Iron Legion: A ruthless and organized military force that serves Dispater and is tasked with maintaining order in the city. They are known for their brutal tactics and unyielding loyalty to their archdevil master.
- The Hellfire Syndicate: A powerful criminal organization that controls much of the illegal activities in the city, from smuggling to extortion. They are known for their brutal methods and have a network of spies and informers.
- The Devil's Advocate: A sly and cunning devil who serves as Dispater's right-hand man and oversees the day-to-day operations of the city. He is known for his devious schemes and cunning mind.
- The Iron Guard: A group of powerful demons who protect the Iron Tower and Dispater himself. They are known for their unwavering loyalty and formidable fighting abilities.