I was going to suggest the same two lakes that BB just did. I have heard there is border markers on Ross lake so as long as you dont cross them your canadian license is just fine. You could also get out of the boat and enjoy some C&R trout fishing along the Skagit river if you so feel
Jones lake is listed as rough road in my mapbook however i know friends that have gotten cars in there as long as you take the bad spots slow, if you have a truck or Suv then there is no worry. Be careful about the shoreline with summer draw down i have been told it gets mucky and vehicles can get stuck out there
HOOK - has been to Ross lake but never to Jones cause little cutties dont interest me when the lake is surrounded by partying morons