These look like really cool options but for travel I can’t see past using Joplin for planning anything we may want to do along with a couple of images, brief description, pricing, opening hours, url etc & .pdf’s such as tickets or menus etc can be stored too.

In addition I use OsmAnd+ with all potential places we might want to visit pre-saved. In Europia-land at least, public transport data has been fantastic & I love the Wiki data available in OsmAnd. Everything is available offline too.