Exactly this......I've decided ...... You MUST make your plans known! My beloved next of kin know exactly my wishes, No expense. No funeral cars /entourage, flowers etc blah blah blah.
A simple cremation or burial (whichever the cheapest) Ashes spread somewhere dear to their hearts where theirs will eventually be!
Make sure you have it written down and your grasping relatives (oops sorry, your nearest and dearest!) know where the instructions are. Think what music you want, where to have your ashes spread and how much to leave behind the bar for those left behind. I've been to fair number of funerals for various reasons and have had some good laughs in amongst the tears - one of the best had photo's projected onto the wall of the Crematorium of the deceased.....my, there were some belly laughs!