I'm not really a resort person. But I do subscribe to some travel feeds mostly in the vein of maybe finding some places/attractions/restaurants/etc. that I'm not familiar with. The number of hyper-scheduled spreadsheets I see is amazing. Doesn't mean I don't often have some itinerary and even book some particular, popular attractions/venues. But the 30-minute block scheduling is something I do for work (if that).

ADDED: I'll just add that I created a loose spreadsheet for a ~week-long NYC trip with (I think) just one timed admission for a recently reopened museum and no times otherwise. I think I ended up dynamically scrawling over the printout with changes for most of the trip.

I have an upcoming trip planned in asia - never been before.

My firm rule is - have a loose plan, aim for one activity per day, an emergency option, or two, if the weather plays up, and that's it.

It's the type of plan that has worked for every holiday that I have taken that involves a different city to the one I live in.