i have no idea. i went to all the tourists spots in the summer. taipei 101, dictator memorial hall, jiu fen, hualien, danshui, shilin, gu gong, and i didn't notice hoardes of mainlanders anywhere. there was some about for sure but never enough to bother me.
when we were in hualien we got a kind of tour taxi, maybe thats a better option than a tour bus? thats all i got though.
i had a holiday to tropical island type place earlier in the year and the chinese there did indeed get on my tits. i just can't understand their holidaying style to be honest. its not relaxing or enjoyable at all imo.
that comment about the gansu person is pretty funny.. although taiwanese are not much better with their opinions on china. i tend to avoid the subjects of either country if i am with chinese or taiwanese.