flying your own helicopters, you'd need to be super rich, putting together and expedition to climb everest with a full team behind you, also super rich.
Flying a helicopter, climbing a mountain(Snowdon) doesn't require being rich, neither does skydiving, nor most other things, likewise most of them are almost entirely safe when done properly with proper safety precautions, would you, just because you were rich, stay inside because even crossing a road can be dangerous? Would be a bit pointless.
Likewise getting a decent house for 500k, ok I'm sure you can, and infact I'd prefer to live in some fairly cheap but ridiculously big mansion out in the middle of nowhere rather than a penthouse studio for a 1.5mil in central London.
Also 5% return on 2mil would only be 50k after tax, not at all bad, better than most but not crazy playing around money, bills and council tax on a bigger house will take up a decent chunk of it
Meh, the main thing I'd do if super rich, would be to own more than one decent house, live part of the year in the UK, part in the states, part in maybe Barcelona, part on some distant not quite deserted, chavs not welcome, clear sea, fantastic beach having island aswell.
You can go skiing with better accomodation, sky dive more often, buy your own helicopter but none of that really appeals to me.
I'd love to couple a fantastic mansion on a paradise island with a fantastic sailing boat and learn to sail, that would require a lot of cash.