I'm a ler and a lee. In either role, I enjoy finding the tickle spots that are the wildest. As a ler I'll figure out how and where my lees love being tickled the most, some prefer gentle, some have asked for torture, and some both. For me it's also the suspense and playful agony of the lee knowing what's coming, and the ler slowly building to it. Verbal teasing and creative helplessness ("Can you keep your arms up?", etc.) adds a lot to it. Because I like the mental aspect, my favorite "tool" is the fingernails since it's the most refined.
I should note that I've also driven around the Midwest to so so... part of the adventure. 🙂