A personal goal of mine is to double my age in countries visited. I'm currently 29 years old so that would be 58 countries. I'm pretty far behind but catching up quickly. So my three week vacation would be designed to hit as many countries as possible while still getting a true enough taste of each (so a few days in each at minimum). In 2019 I did quite a bit:
So for this 3-week fantasy vacation I'll go with:
1 week split between Zurich and Prague
1 week split between Athens and Istanbul
1 week split between Amman and Tel Aviv (planning this one in November 2020)