I'm doing an organized ride this week - the Bicycle Tour of Colorado. 400+ miles in 6 days and all in the mountains. I've noticed several competitive riders and teams doing the tour. A few triathletes, also. What a great way to rebuild base fitness after the first (or second) A-priority race of the season. Lots of climbing to re-establish force and lots of zone 2, aerobic, steady state. Perfect. And someone else takes care of shuttling all of your gear and provides feed zones along the way. I'd highly recommend it as a way of kicking off the second half of the season. Of course, you would need another 4-8 weeks after it's over to increase the specificity of a Build period in preparation for the next A-race of the year.