I have yet to do tour de blast, but I love Barlow trail. Even with the ridiculous heat last year... it was a true sufferfest, but it felt nice to finish. Haven't had as much time on the bike this year, so doing them back to back would probably kill me, so you may want to just go with one. I will say the females that ride barlow from rivercity are even better than the scenery around Mt. Hood.
