I seem to observe a recent increase of bicycling groups hitting the roads, in fancy colorful "aero-slippery" dresses, even wearing aero dymamic helmets and on quality bikes.
As, others posted above, I think, that while the DR certainly would offer the scenery attracting this kind of sport activity, it would seem extremely dangerous to mix in with the crazy motorized street environment.
Here, the stronger rule and seem to demand preference in speed, space and sequence over the weaker, putting bikers and pedestrians last on the "food chain". Making cycling look like an extreme sport and mountain and/or off road biking like kid's stuff when compared to it.
Why not try bungee jumping or something like that instead, it's said to be safe and fun too
... J-D.