Silly questions: 

What terrain does a sea-ranger use? Aquatic? There is no 'beach' but historically tropical islands are the most common island types not counting the sailing around the bottom of africa and south america...And now we are in space, so there's that.

Build wise, I'm focusing on being a troll-hunter so I'm taking giant-type for my favored enemy. But I am pondering weapon builds. I have no great desire for two weapon fighting so that leaves either archery with a compound bow (which means str and Dex) or melee with a two-handed weapon to make maximum use of the build. I want to do more than just damage so I'm considering focus in a maneuver, either trip or disarm.

IF I take trip then I'm focusing on a scythe and the takedown feat, dealing 10 damage grants a free trip attempt. With a scythe's 2d4 base and 1.5 str damage, even an 18 str for +6 I'd get a free trip 3/4 of the time with a 4 or more dice damage.

If I take disarm, then I'm taking either spiked chain or heavy flail, both have a +2 to disarm, Heavy flail is martial where spiked chain has reach but is exotic.