I have a bajillion routes to get you from Kingston to Ottawa and I've explored a fair bit of the region north of Ottawa (to Tremblant) and North West to Mont Laurier and Maniwaki.
My favourite route from Kingston right now is 38 to Sharbot lake, 7 west for about 2-3 mins to the 509 North, then route 36 East (at Snow Road Station), to 12 east then 8 to Hopetown....then North East to Almonte..through Almonte to highway 17, Here there's an option depending on time, it's more fun to head west towards Renfrew then cross over the river to the Quebec side and follow the road east along the river on that side to Hull. If you're rushed head east straight away on the 17 to the 417 to Ottawa.
Really the only reason I take this route is that highway 38 to Sharbot lake is great and the 509 is an amazing road out in some great countryside with a few twisty bits.
If you have a dual sport I have an even better route for you.