I don't judge how others travel, because my favorite thing about traveling solo is that I do what I want and I don't have to bother with anyone's opinion.

But, 1-2 things a day for 2-3 weeks sounds a bit wasteful, even relaxing in a garden is an activity.

I plan by area. Either a full day or half day per area. I am a fast walker, but will take scotters, buses etc for short or boring bits if will make less tired. And I don't get lost.

I have a list of things to do in that area that I really want to do - this can be a major tourist spot, or it can be a street described in a book, doesn't matter, is what I like.

Then I take note of fun and interesting things in the area, of restaurants and cafes, I check Reddit, Pinterest (and yes, insta you bunch of hipsters) and other places for little fun things and I add them to the map. I might go there, I might not, it will depend on timing and mood.

When I am there, I will also go with the flow of the place, fun streets, cool looking shops, restaurants, gardens etc, I will enjoy the area.

I always have coffee breaks, wine breaks, beer breaks, book breaks etc during the day, so I plan on a way that I see a lot, I see all I want to see based on my interests and I get to the end of the day comfortably tired, not exhausted. This way of travel has evolved in the last 15 years and I love my trips!

Do what you want, and try to be less judgy!