Scattered my dad's ashes yesterday at the river, a spot which is slightly off the path.
Today I went to the spot but there were 3 other people there. I walked over and they looked up so I said something like I'm sorry to disturb you, I just wanted to take a moment. They said okay and I kind of sobbed "I scattered my dad's ashes here" to explain. I sat for only about a minute, during which time one of these strangers offered me a roll up. (No thanks) then I left saying I hope they had a nice day.
The group seemed a similar age to me (around 30) if that matters. I'm hoping that this is an understandable enough interaction and I shouldn't feel weird about going back another day.