assistant: My apologies for the misunderstanding. Here a few activities more suitable for your D&D campaign than the local business tourism board.
- The PCs could attend a carnival to honor the winter solstice, featuring bats with flaming wings which are used to divine the fecundity of the city's herd of sheep. And don't forget to buy some cotton candy made of metal wire and feed it to baby dragons!
- The PCs may participate in the light-hearted city-wide competition to find the citizen who most resembles the archdevil Dispater. The first reward for the winner is their weight in onyx, the most prized precious stone in the city. The second surprise reward is the honor of performing the duties of archdevil Dispater at any event where he is likely to be assassinated.
- The local street urchins could teach the PCs the game of "Urk," where the players take turns to pickpocket the city guards. Whoever gets the biggest loot from a single encounter wins. Whoever gets caught loses. The game is called "Urk" because that's the sound the loser makes when the guards impale him with their sword.

assistant: Of course - I really enjoy these sorts of stories.

Here are some thoughts on entertaining and surprising events.

1. Upon entering the outer city the players encounter a group who ushers them to a hidden building, then attempts to hire them to overthrow Dispater.
2. Several city dwellers try to drive off the party, knowing their presence will bring nothing but suffering.
3. The players hear a loud crash and see a captive Gryphon has escaped, trailing blood it is turning towards its captors for a last stand.
4. A makeshift market is located, selling black market goods at 'too good to be true' prices, what's the catch?
5. The party is captured by Dispaters guards and forced to fight in the arena for the archdevil's amusement.
6. A small voice is heard coming from a storm drain, it's an urchin child, their mother is ill and needs the players to follow.

Of the above options, any could lead to unusual things to see and do. 

The urchin could lead to a forgotten underground city, smashed and buried in the haste to make Dis.
The black market could hold amazing items from foreign lands, one of which could teleport the party to a pocket dimension.
The infamous 'River of Blood' can be seen streaming from the tower gates, is it really blood? So much blood...

Let me know if any of those options sound interesting.

assistant: you are correct you are asking about a dungeons and dragons campaign. I'll try again.
In the city of Dis there are many activities adventurers/players can do such as;
- Searching for treasure in the ruins of the old city.
- Fighting monsters in the city's dungeons and catacombs.
- Searching for artifacts and relics in the city's dungeons and catacombs.
- Discover the true king of Iron Tower.
- Searching for magical items in the city's dungeons and catacombs.
- reach the unreachable tower of black Iron.

assistant: Here are a few suggestions for activities that your players could engage in within the hellbound city of Dis:

Exploring the House of Leaves: This mysterious structure is said to be made entirely of shifting, organic leaves. The players could venture inside to discover its secrets and possibly discover hidden treasure or hidden dangers.

Visiting the Oldest House: This ancient building is said to be one of the oldest structures in Dis. The players could explore its halls and chambers to uncover its history and possibly uncover ancient relics or artifacts.

Touring the SCP Research Facility: The players could tour this top-secret facility, which is dedicated to the research and containment of supernatural and paranormal entities. The players might have the chance to interact with some of the captured specimens and possibly discover new information about the workings of the multiverse.

Learning How to Write an SCP: The players could attend a workshop or lecture on writing SCP (secure, contain, protect) documents, which are used to describe anomalous objects, entities, and locations within the SCP Foundation.

Studying Music Hyper Set Analysis: The players could attend a workshop or lecture on music hyper set analysis, which is a method for analyzing musical structures and relationships between musical elements.

Touring the Containment Facility: The players could tour this top-secret facility, which is dedicated to the containment and control of anomalous and dangerous entities. The players might have the chance to interact with some of the captured specimens and possibly learn about the different methods used to contain and control these entities.

Exploring the Cave System: Dis is said to have a vast and intricate cave system beneath its surface. The players could venture into the caves to discover its secrets and possibly find hidden treasures or face dangerous creatures.

Creating Templates: The players could create custom templates for use in the SCP Foundation, which could include descriptions of anomalous objects, entities, and locations, along with the protocols for their containment and control.

Writing SCP Poetry: The players could write their own SCP poems, which could describe anomalous objects, entities, and locations in an imaginative and creative manner.

Studying Mathematical Algorithmic Boolean Expressions and Notations: The players could attend a workshop or lecture on mathematical algorithmic boolean expressions and notations, which are used to describe and analyze complex systems and processes.

Remember, the focus should be on having fun and seeing cool things, so feel free to get creative and come up with your own activities and adventures that your players could participate in within the hellbound city of Dis!