I'm wondering if there might be some tool or framework others use to plan trips.
I've gotten a lot of mileage (pun intended) out of walking from activity to activity. Relatively random walking is a surprisingly high return on investment, but only traveling alone.
Google Maps "Attractions" is surprisingly good. CultureTrip, Reddit (frequently location based subreddits will have a sticky thread about highlights), AtlasObscura, and google were also great for research. "Unique things to do in ..." is a great search term, "unique foods in ..." is also great. There are also several activity websites which are good to page through.
Hostels are pretty great and incredibly easy to manage. Hostelworld is a great app.
Rome2Rio is a fantastic app for route planning.
I try to make a list of things like the best bakery, a top tier restaurant, a trendy restaurant, the best dessert, a trip through a grocery store, a trip through a fruit stand, and things like that.
I think when booking travel hostels are immensely helpful for figuring out what to do. It's most important to pre-plan super popular or limited quantity activities ahead of time, but other than that, often times you can just show up at a hostel with nothing planned and page through the hostels activity book/ask the staff what's cool.
Step 2 - Put it off until next year
Repeat indefinitely.
This is 100% legal. It also reduces the costs of the trip massively.
So I’d look for interesting conferences and build my plan off of that.
I figure out something that I want to see/eat/experience, and then travel to the required destination.
If I am choosing a destination first, I am probably traveling there for the destination itself, and I don't really plan ahead or care about what is there...I just go and figure it out.
You mentioned flexibility...I think this is key. For me, itineraries or the "need" to have a schedule or do something causes stress, which is what I am trying to get away from when going on vacation.
If I were you in this case, I'd only plan to take cc + cash + passport and some clothes. Don't overthink it.
Try to go to a hostel and stay there with other people. Just follow whatever happens (without doing too much dodgy stuff). Hostel people know how to have fun and find weird things to do. Also, be prepared not to sleep and "relax" though, so maybe only do that for half of the vacation.
I usually travel for several months and hate backpacking so this approach reduces the number of times I have to lug a suitcase around.
When we travel to a destination for more than a day trip, we like to pick a base, and venture out from there.
But it depends greatly on your destination. Finding cool stuff in Denali Nat'l Park (Alaskan wilderness) is rather different from NYC, which is rather different from P’yŏngyang, which is...
I use Open Street Map to find nice walks and bike rides. I use the local subreddit to find unusual ideas.
2) Go to wikivoyage, pick a few highlights that I HAVE to see
3) Book a few youth hostels
4) Go there and walk about the cities while hitting most of what I noted in step 2.
it's a very chill process.
You cannot predict it this far out but you can have an idea looking at the closest NOAA/WMO station hisorical data.