Heck, I bet there's a draft of this class where "Extreme Hustle" can only be used when being chased by a stone ball of Large size or greater.
So if this is the Extreme Explorer, is there perhaps a lukewarm or middle-of-the-road explorer out there?
"Sorry, Scott. You're only a semi-explorer...You're the Diet Coke of explorers."
Seriously, thanks for showing us this class. Where'd you get it from?
(btw, there are a couple of minor typos there methinks. You have him getting the Dodge bonus at 32nd level, and I'm pretty sure you meant to have "Tumble" listed as a class skill, instead of "Timple".)
If it uses a Spycraft like system of action points, then I think it's pretty cool...
Would consider adding spot and listen to the skill set, as I think alertness would fit into the class. As ride is there, I'd add in handle animal as well.
The only other slight thing was evasion class ability - if you went into this PrC from Rogue (or Monk?), then you wouldn't benefit. I'd consider offering a choice of abilities... possibly get defensive roll if you already have evasion?
Looks like fun though... definitely need to get whip proficiency