Awesome project! Which other alternatives did you find/get inspiration from? I haven't really found great options in the (more broad) travel planning space, which is why I am building in it.
I tried Wanderlog, but didn't get the right 'vibe' for me. The one that I actually used is Navitime specifically to travel in Japan, but didn't have as much function as I hoped.
So most functionalities I had in mind was inspired from my Excel sheets that I used over the years for travel planning