To non-native English speakers: lingual hospitality?

Let's say that I (or any other English speaker) am visiting your native country. You speak my language (English) but I don't speak yours. Not very well, anyway - I know the basics, and I'm trying, but it just isn't working. If I'm attempting to talk with you in your native language (and you know we both speak a common language), would you (a)switch to English or (b)remain in your native tongue? Why? Would you find it annoying that I'm speaking your language so poorly, or would be gratified that I tried? Would you choose efficiency, or would you be willing to help me learn?

I've been really curious about this for a while, so I'd appreciate any feedback/opinions.