D&D One Shot

The PCs are retired dragon hunters who must make a trade with a celestial valley. It might involve gnolls.
There is a well-dressed witch who offers them aid.
The characters start outside some ruins. Partway through there is a chase scene. If things are going nowhere a character has to make a Perception check.
At the end there is a reward of the key to a planar portal.

The PCs are all members of the same crime family who must slay a wealthy yeti. It might involve orcs.
There is an old druid who sets them the quest. they are the drinking companion of a character.
The characters start in tense negotiations. At some point they encounter a challenge to a duel. If things are going nowhere a chase starts.
At the end there is a reward of a random magic item.

The PCs are novice pirates who must find a magnificent chest. Two of the characters have fallen in love. It might involve a criminal organization.
There is a shapechanging healer who falls in love with a character. they worked together with a character.
The characters start running away from something. At some point they encounter an unexpected admirer. If things slow down they receive a useful sending spell.
It finishes with a reward of a random magic item. Possible sequel... a foe returns more dangerous than before

The characters are heroic dragon hunters who must defend a sacred high temple. Two of the characters have fallen in love.
It is at a fortified quarry which is protected by a druid.
There are a group of celebrating goblins enjoying intoxicating mushrooms. And a beloved general wants to steal a herd of dinosaurs.
At some point a character learns something useful with a Perception check.
As the adventure progresses objects start to talk

The PCs are famous dragonborn who must destroy a celestial chest. It might involve snakes.
There is a young cleric who wants to do the same thing.
The characters start in a tavern brawl. At some point they encounter lots of vermin. If things get stuck there is an earthquake.
At the end there is a reward of an island temple. Possible sequel... one or more characters start having dreams related to a NPC from the adventure