UPDATE: My apologies in that I sent you the incorrect link (listed below). The first link I posted below and sent to you was for a 155km version and the NEW 200km Alternate Return. 

(if you want to do the 155km return, this is certainly an option. Please reach out to me and let me know your intentions)

THIS IS THE LINK TO THE New return route for the 200km, https://ridewithgps.com/routes/53971248

This updated return offers limited resupply in Renfrew and Eganville. Some stores will be open late into the night, like Tim Hortons and Subway. Do some research and you will find the obvious spots and some hidden gems as well! 

Alternate Return Route for the 200KM Event. 

After much deliberation it has been decided that offering a new return route for the 200km riders is in order. This is due mainly for safety reasons around the use of the Algonquin Trail from Pembroke to Petawawa and its return during evening and night time hours. Second to this reason is the continued degradation of trail conditions making the route nearly impassable in recent years wherein the spirit of riding/pedaling your fatbike is taken away. 

Leaving Mallard's Milk Bar Checkpoint in Arnprior, this return route will take riders Southwest towards Calabogie and into the rolling hills travelling West into Douglas and its farm fields with a finish on the Algonquin Trail as you climb into Cobden on that notorious false flat section! 

This return route will offer the rider a little bit of everything, from pavement, gravel, skidoo trail on summer roads. Re-supply is EXTREMELY LIMITED. Your only options being in Burnstown at the NEAT Cafe and again in Douglas, if the General Store is open... 

Here is the return route: https://ridewithgps.com/routes/53799265 (this the incorrect link for the full 200km route. This link provides a total distance of 155km.).