Um, I'm not sure this will work for you but I always stretch, which makes my shirt raise up and for some reason people can't resist tickling my stomach or sides.
I also tell my friends I'm bored and tell them we should play something random. When they ask what, I say something like "Let's play make me laugh" or something. Then I do my best to hold in my laughter and once I get to my last friend and they realize nothing else will work, they'll tickle me to "cheat"
I take the remote from my friend (or boy/girl friend) and teases them with it, the more they reach for it, the more I pull away, exposes more spots and that gets them to tickle me but for some reason, once they start then, they never stop.
Like I said, I don't know if any of these will work for you but these and some other stuff always works for me.