DH died last year, 6 months after a diagnosis of acute myeloid leukemia, so we had plenty of time to plan. It was blessedly easy (and inexpensive) to go to the local funeral home beforehand, pay up front for cremation, and then hand the funeral home card to the hospice social worker when his time came. So far bits of his ashes have been dropped into the lake behind our house, the Panama Canal, from a ship off the coast of Costa Rica and, just yesterday, in the harbor in Reykjavik, the place we last visited and one of our best trips. (I deposit them in a tissue wrapped with string- all biodegradable.)
My plan is to continue to bring some of DH's ashes in my future travels. When my time comes, which I hope is a few decades from now, what's left of his will be mingled with mine. I haven't really thought about where I want them to go- it will be up to DS..