STR with River access in property

[Vaheh Takhmazyan]

Our property resides on a 2.5 acre land with the river running through the backyard in California. Before going to a attorney and asking them, what should I be aware of, any cautionary advice? 
Ill place a “swim at your own risk, no lifeguard on duty” sign. What if a renter gets hurt or drowns in the river? 

Thank you 

[Vaheh Takhmazyan]

Quote from @Paul Sandhu:

Why do you have to ask an attorney about minor things.  I've got guys that are working 300+ feet in the air in a basket held up by crane with a welder.  A river in the back yard is the least of their problems.

Because this is Southern California… :(