It's difficult to be helpful, without a lot of local knowledge - and we too have experienced that there just isn't much out there for sciency kids. (A friend and I were moaning about the lack of science summer camps here, and fantasising about starting one - oh, except that we both have jobs already. Oops.)
Are online communities any use? There are various online maths sites that have some kind of community attached to them, where kids can e.g. compete against one another or discuss problems. Art of problem solving is the one I know best (Alcumus plus discussion forums plus a competitive game called For The Win which I have no direct experience of) but I think Mathletes has something similar...?
