The other day I saw a post here about trip planner being the most failed startup idea (
https://blog.garrytan.com/travel-planning-software-the-most-...) and by coincidence I found Inspirock a few days later, which, in my opinion, is the best implementation of a trip planner I've ever seen. I'm not affiliated to it, I simply liked the idea execution very much. Don't know if it will float or not, sadly.