‘I feel like I’m heading in about 20 different directions at once while trying to plan, so would love some feedback, constructive criticism and advice…’
This is a common situation and also very logical. You can't and shouldn't try to plan everything. As for a trip, you leave by defining a few essential places to visit, but it is then, on the spot, that you will discover the interest or the desire to visit others. Otherwise the process is too mental and, indeed, you can go crazy imagining 20 directions at once!
That said, in your list I see at least two that you will never be disappointed with: Maths and Disting mk4. They are not the most exotic modules, but they are like the Louvre and the Eiffel Tower... pretty much unmissable.
'On ne devrait jamais quitter Montauban' (Fernand Naudin).