ok so this is going to sound bad.
Uk sucks..other than goodwood
rest of EU.
there lots to do, I've done minor things, oktoberfest, nurburing, bunch of car factory/museums Louvre effile tower and you get drift, the big suggestion is get out of the capital, small towns are much more fun.
diving is awsome, i've hit it in qld fiji vanuatu araningfillo later this year and some thai action
that said doing slow boat though meekong from thailand to laos was awsome you need to match your wants to avalibility.
shopping can be good if you know what you shopping for, i've sent hours buying car parts in california Hk has cheapest apple gear in world, great for gifts
done bungy, never again, jet boat is cool, zorbing is fun, zip lining, abseiling blah blah .NZ and vanuatu great for that
asia can be fun excluding cars
short of it is been there done that!