According to what I've read, don't do any hunting on your own without the proper licenses and knowledge about seasonal regulations. Even if you're good at reading maps, don't go only by the maps to find your way around. Ask the locals for directions. http://voices.yahoo.com/eight-things-not-visit-iceland-6967724.html?cat=16

I think, Icelanders do not expect tips for service. But, you can provide tip some cases where the restaurants are allowed to do such activities that ok. Some related vital information may be found here to read.. http://goscandinavia.about.com/od/icelan1/tp/10-Things-Not-To-Do-In-Iceland.htm http://www.whatson.is/practical-information/

I recommend you to visit http://www.safetravel.is/ if your going to travel :D Just remember the emergency number is 112, (icelandic rescue team has the same number) There is a really good app that is call 112 iceland. there you can check in your gps status so when you get lost it is better for us to find you. Also when you call 112 they will get your GPS status. ( the rescue team is a free so, if you get lost, just call :)