City trip solo with a toddler

[Orphanblue]

I am thinking of taking a city trip solo with my 2.5yo. He is very energetic so we would be doing plenty of outdoorsy stuff, parks, playareas etc. Have you done this before and how did you plan for it? Any advice? TIA!

Mine are grown up now but we liked Copenhagen and Barcelona for family trips. That was pre- smartphones and apps etc so we tended to wing it and there were two of us adults admittedly.