I went to Idaho with a buddy this long weekend and we rode the Trail of the Coeur d'Alenes from Plummer to Wallace and then back the next day. It was my first day backpacking (though we stayed at a Hotel in Wallace) on a bike and it was an absolute blast. While we weren't setting off to make any PRs or any amazing time, it was nice to cruise on a paved trail with no car traffic and some pretty nice scenery, and Wallace is a great town if you like to have some fizzy pops after a ride. We would have went to Mullan a little past Wallace, but grinding the last KMs in 40 C was just a little much near the end. Hell, when we set off from Plummer it was 21 C at 7:12 AM in the morning.
Definitely a ride I'd like to go back and do in the fall when the weather is a bit less aggressive, and highly recommend it for those looking for a nice day out, though there aren't many climbs for those who like them (heh I do, my buddy not so much).