Swimming Speed increase from 30 feet to 60 feet
 When completely submerged in water add +10 to Dex(Sneak) checks, when it is raining add +5 to Dex(sneak) checks
 You gain the ability to detect if it will rain the following day and also the ability to discern if a body of water is fresh or salt. if its pure or tainted. if so how is it tainted (DM Digression)  
immunity to poison and the poison condition  
immunity to cold temperatures and climates (does not include damage sources)