Even that presumes you already know when you’ll want to leave and come back. For me, I’ve got a vague idea, but it’ll depend on how much time I want to spend there. And that’ll be based on what I want to do, which may only be available certain days of the week or times of day. And that’s before factoring in the prices of those things relative to their availability and how much I want to do them.

To figure all this out, I’m going to need to keep notes across several browser tabs, likely while communicating asynchronously with whoever else is going on the trip. All of this is dramatically easier with an actual computer.