My dad had some really specific requests when he went, I think mainly to mess with us posthumously.
We had to sprinkle half of him at his favourite place to stop on a bike ride in the Lakes, and specified that we had to ride the full route to get him there. After lugging the quality street tin full of ashes for miles, up and down the bloody hills, it was more a feeling of relief when we lobbed them into the air rather than anything poignant.
The other half had to be scattered off a Thames barge, into the river Blackwater, in a Barge match (race). This only happens once or twice a year, so we haven’t got around to it yet.
It’ll be organ donation/med student donation for me, although hopefully by the time I do go they’ll be able to grow all the organs they need in labs.