'Consciousness is not simply a sensory-perceptual affair, a matter of mental imagery, as the contents of our mind would have us believe. It is deeply enmeshed with the brain mechanisms that automatically promote action readiness' - Jaak Panksepp
Sure, ISP works, though I have seen people say either one for you. Anyway, lots of people call me an ISTP, and a lot of that is based upon my adventurous and explorative nature. I guess an F is more moderate and peaceful, whereas a T is more extreme and tenacious. In my opinion, you fit the ISFP description better than the ISTP description. Enneagram 9w8 also works, since you seem fairly free-spirited and like to just go with the flow. ISTPs would focus the flow.