Panasonic G2 or Olympus E-PL8 for tropical landscapes?

As an interim solution, you could buy a factory refurb E-PL7 for $300 and then sell it lightly used for very little money lost. But since you don't already have an accessory Olympus EVF and you're mostly shooting with two OIS lenses anyway, then the tiny, micro-SD card only GX800/850 is certainly an option but it's destined to loose a lot of value when sold used (unless, of course, you plan to keep it for a long time). For about the same money new, the GX80/85 is popular for it's built-in EVF and 5-axis IBIS and standard-size SD card slot. The GX80/85 has been out longer too so after finding a lightly used example, you could resell it for about what you paid. Then again, at only 269-grams, the GX800/850 is certainly a lot smaller and lighter than the GX80/85 (426g) or even the E-PL7/8 (357g).

Personally, I love having the excellent VF-4 to add-on when desired and that limits me to E-P, E-PL, and E-PM bodies only. I'm one of those people who vastly prefer a tilting display over a fully-articulating one so not even the PEN-F provides much temptation to abandon my tilting VF-4. And while I like the appearance of the EVF in the GX80/85, it is drastically smaller than the newer Olympus EVF's (and the VF-4).

The output from the 2010 G2 (older 12mp sensor, 428g) wouldn't be a very appealing way to capture images from a trip that I'd like to capture and remember.