Tree planting and other forestry related jobs, forestry tech specifically, would be a great way to spend the months making money and, more importantly, working up some useful skills for your trade. My advice would be to track down every forestry consultant in the country and send out a résumé and covering letter that explain your circumstance and wish for employment.
As an example, previous to my enrollment in the CF I was employed with Forsite Consultants LTD (
http://www.forsite.ca/) where I completed road traverses, bridge surveys, cut-block layouts, bug hunts and GPS mapping. The main benefit to the future infantier is walking about in the woods encumbered, navigating, using equipment and completing tasks within timings. The job also pays well, which may allow you to negotiate for a short-term job in exchange for a drop in salary.
Beyond that, the advice to live it up somewhat while you still can should be taken. If your courses shake out properly, you may find yourself doing IAP, BOTP, Common Army Phase Training (CAP) and then Dismounted Infantry Platoon Commander (DP1.1 formerly Phase III) all back to back. That's a long tunnel to travel and I suggest you get in some good times now to light the way.