Well, it could be that they get caught up in a battle between magic and technology. Or perhaps they have to solve a mystery that combines elements from both the Wizarding World and the Doctor Who universe.
The doctor could also be a Muggle - born wizard who has combined Muggle medical knowledge with magic. This kind of doctor would approach Harry's situation from a different angle. They might use Muggle - like scans enhanced with magic to look for internal problems. They could offer a fresh view on how magic interacts with the body, which could be very helpful in diagnosing and treating whatever is wrong with Harry.
Perhaps he uses the island as a secret training ground. He could practice advanced spells away from the prying eyes of Hogwarts faculty and students. Harry might also build his own magical fortress on the island for protection and privacy.
They might also embark on a diplomatic mission. With the wizarding world in a state of flux after the war, different magical communities need to be brought together. Harry, as a well - known figure, and Ginny, as a respected witch, could visit other wizarding countries to establish alliances and promote cultural exchange. This would involve meeting different magical customs, dealing with political intrigue, and making new friends and enemies along the way.
They could have an adventure where they have to stop a dark wizard from using magic to take over the non - magical world. Harry uses his magic skills, like casting spells to counter the dark wizard's attacks, while Clint uses his archery skills to take out any minions the wizard has. Another adventure could be finding a magical artifact that has been lost in the non - magical world. Harry has to use his knowledge of magic to track it down, and Clint helps him by using his connections and knowledge of the area.
Perhaps Harry Potter and the dinosaurs embark on a journey to find a lost magical artifact that has the power to restore balance in the wizarding world. The dinosaurs might know where the artifact is hidden because they have a connection to the ancient times when the artifact was last seen. Along the way, they face various challenges like dangerous terrains, other hostile magical creatures, and traps set by dark forces. Harry has to use his magic skills and his ability to talk to dinosaurs to overcome these obstacles.
They might go on an adventure to retrieve a lost magical item that has the power to disrupt both their worlds. Maybe it's a magical stone that has the ability to open portals between the Marvel universe and the Harry Potter universe at will. They would have to face various challenges, like magical creatures from both universes that are guarding the stone.
In fanfiction, Harry Potter going to France could lead to an adventure where he gets involved in a mystery related to a powerful French magical artifact. He'd have to team up with local wizards to solve it and in the process learn about the rich history of French magic.
He could have adventures like exploring uncharted magical islands. Maybe he'd encounter new magical creatures and have to use his wizarding skills to either befriend or fend them off. For example, he might come across a group of mermaids who guard a powerful magical artifact on an island.
Well, they could have all sorts of adventures. Maybe the baby cousin has some sort of special magic that Harry doesn't know about yet. For example, the baby cousin could be able to communicate with magical creatures in a unique way. And Harry, being the curious and brave wizard he is, would want to explore this new aspect of magic with his little cousin. They might go on a journey to find a rare magical creature that only the baby cousin can sense.
They could have an adventure where they help Camelot defend against a dark sorcerer. Harry's combat magic from Hogwarts would be useful, and Merlin's knowledge of Camelot's magic and its secrets would be crucial. Another adventure might be to find a lost magical artifact that is important for both Camelot and the wizarding world. Along the way, they might encounter magical creatures unique to Camelot that Harry has never seen before, like the Questing Beast.