In reply to murray and Robert:
I agree with your examples, and certainly the two words are not synonyms - I suppose I ought to have written 'adventure implies (is a subset of) risk', but the lazy 'equals' won me over.
Anyway, the feeling of adventure on a 'safe' alpine route will either come by dint of a lack of experience (i.e. once you know, through repeated experience, that you are safe [whether or not it looks like you are] the sense of adventure will wane), or because it actually isn't safe (still exposed to the elements, for example).
The OP wants to feel adventure on a safe route, so either he'll be deceiving himself (possible through lack of experience) or he's only minimising some of the objective dangers. Fine by me, in either case!
Post edited at 13:24