Tribal tattoos have been practiced for thousands of years. Modern people still get them done for many reasons such as to belong to a modern 'tribe' even if they do it on a subconscious level. Getting tattooed was also seen as a rite of passage into adulthood.
People in this type of tattooing always express personal touches and personal expressions. There is one thing that I would like to warn you about and what to do about it. You are going to be stuck with a tattoo for a LONG, LONG time, so you might as well choose a tattoo worth your while. So you should do what some famous people have done.
Granted it is a little saggy and faded now but he still has one on his forearm nonetheless. So the whole tribal tattoo and the growth in interest for Hawaiian designs have combined to make a hot and growing market for Hawaiian tattoos. This is really an up and coming thing and it not huge yet. However many tattoo artists are spotting the trend and jumping on it already.
What do you want to express through the tattoo? This will surely help you narrow down your search options so that you can choose the perfect tattoo design that you want. I have some that I do not hesitate to share, so here they are. If you like outdoor things like trees, nature in general, animals and other things, you can use it as a motivation to get the tattoo in this category.