For the environmental activist’s funeral consult How to Go Green: Funerals.
Don't worry about the deceased’s debts; they go to the grave unless someone co-signed. BUT don't be surprised to get calls from debt collectors who try to convince relatives that they owe the debts.
For details read The New York Times article, You’re dead? That won’t stop the debt collector.
And, never fear, there are plenty of recipes for funeral potatoes online.