Can I come too then? Sounds fun :P

Your boss may be cool outside of work. Give him a chance.

Hope your boss is an asshole. If he's chill have a good time if not , well there isn't much you can do now without making it awkward . Good luck op. I never really want follow ups but this I'm curious about .

Work just seems to follow you everywhere you go..

why'd even have to announce dat shit doe?

Suck up to him while you're on holiday and keep your job for a long time

FYL, your boss is a doushnozel.

I learned this in middle school. If you don't want someone inviting themselves along, you don't mention a fun event until after you have done it. Especially around the holidays, because people get lonely and assume they can invite themselves along. If you do not want your boss coming with you, then take Boss to the side and let him know that you do not have extra room and are sorry. But I think you might get some points with the bossman if you invite him along.

I may as well join ya

The trip must have sounded great and it must have sounded open ended...have fun