Another part travel / part sports-related one. I seem to have a lot of items on my list that are related to either of those categories (or both). The OH and I would love to go on a cycling holiday once, and I think it would be a nice feature to travel from the northernmost to the southernmost* point of a country, if only to say you’ve seen it all..
My absolute dream would be to cross the US this way, but it would take quite a bit of time.
* Or south-north, east-west, west-east, … You get the point 😉