The nonsense characters are
initial letters of the following sayings: "Money doesn't grow on trees", "You have to spend money to save money", "A penny saved is a penny earned", "You get what you pay for", and "You give a poor man a fish and you feed him for a day; you teach him to fish and you give him an occupation that will feed him for a lifetime".
(Note: I didn't look at AHKieran's answer.)
The connection to Halloween or hiking isn't obvious to me, though.
Something to do with not giving sweets to trick-or-treating children? Some connection with "money is the root of all evil"? The "spectre haunting Europe" at the start of the Communist Manifesto?! These all seem very unsatisfactory indeed.
MOehm points out in comments that
the 31st of October is not only Halloween but also something called World Savings Day, a thing promoted by banks, especially in less-wealthy countries. That seems relevant though it's not clear how it leads to an actual answer.
Maybe the answer is just
money (which I suppose you could describe as "a little green" in reference to the traditional colour of dollar bills, though that line is allegedly just fluff).