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1. Complete
Gaptooth Breach hideout in free roam
2. At the end,
take the carriage to
Great Plains
3. Kill
ONE of the horses on the carriage
4. Find
easy access to the
river, like a
hill
5. Drive the carriage at
full speed down the
hill
6. The horse should
die, and once the carriage gets to a certain point in the
water, it will throw you into the
water and you will
glitch back on
7. You will either be:
(i) Floating off down
stream 
(ii) Stuck, in which case whistle your horse in to knock you further a couple of times :y:
(iii)
Dead, cos you failed, and now you gotta do Gaptooth Breach AGAIN. 
8. Try not to move around on the carriage, unless you can get to to the main part.
9. You will sail off into the
distance!
There are many spots around the map of
Red Dead Redemption where you can do this, get an
online posse and as many carriages as you can and try different places!
Alternatively, if you the tutorial didn't help

, search for
CaptainSubovon on
YouTube