Generally if I unpressured they are more vocal, and willing to cover a long distance to reach you. Working a bird several hundred yards is pretty common. What part of the state will you be in? Rios are found in vastly different habitat around the state which can really dictate how you hunt them.
A good glass/crystal call is great for covering long distance to strike up a bird, generally my go to call. Afternoon hunting can be great. It's very common to get a bird fired up that is a half mile away, not hear a word from him for 15-20 as he navigates towards you, then have him pop up right in your lap. They typically roost in the same tree or group of trees each night, which are normally located near a water source.