The usual preposition is on. You can say 'sailing down/up the river'.
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Soprano"You can go sailing at the river"?Technically, it's wrong to end a statement with a "question mark".
dimsumexpressTechnically, it's wrong to end a statement with a "question mark".But the whole sentence asks if it's wrong to say it, so it's a question if taken in its entirety.
SopranoIs itIt's not wrong if by that you mean, for example, that one can rent a sailboat there, so that at the river almost means at the place along the river where the rental shop is located. That's the same meaning of at as in You can have a good meal at the cotoowrong if someone says "You can go sailing at the river"?
CalifJimthe whole sentence asks if it's wrong to say it, so it's a question if taken in its entirety.Uh! Thanks for pointing that out. That's the difference between a real Guru and someone who is just a "wanna be".