It was a beautiful place but we are in group trip with a bus and it is a halt point for rafting...If my wife and i went there together we could camp in there and actually i can't do fishing but i can eat a lot :d

In long exposure you should do four important rules :

1- shoot in RAW so you can change the exposure a little bit later if it is neccessary
2- shoot with a quality lens that takes inside more light so it stops vignetting...
3-use a tripod and a remote controller
4-For the day long exposures you take a quality ND filter...
5-And the last one : you choose the cloudy days and make a good composition

that is all :) thank you for your comment and support :)