You know the 'You can't go any further' message so what Divine Beast do you think would be beast to steal I mean borrow for your trek to explore the far reaches beyond Hyrule? The most difficult but rewarding I think would be Medoh due to it's similarities to a civilian plane but if you play enough MS (OR ANY) Flight Simulator software on 'medium' to 'hard' settings where you arm various failures and learn to recover from them I think flying Vah Medoh is doable manually.
Vah Ruta I think would be an okay choice but painfully slow and if it gets hit in the wrong spots could sink like any submersible.
The camel dungeon I think is the 2nd best one for long term travel but a lot of blind spots due to how high up it is and the shocks suck. If you watch how hard it bounces when it comes to a full stop then come back and tell me if you feel comfortable riding it long distance.
There's also the lizard dungeon which can handle extreme heat but I'm not sure how well it would do in even minimum cold weather.
there doesn't seem to be anything here