Welcome to the party!
Yeah, what Porschenut said is pretty much the jist of it for that mileage. Aside from the usual stuff to look for, the general maintenance items need to be addressed based on that. Nothing else that I'm really aware of or different from any other bike.
And I would disagree with the camchain tensioner. It's pretty much the same non-return plunger type tensioner Kawi and lots of other manufacturers use. You hear people complain about them because they don't really know how they work and their bike gets "noisy". Being this is a Kawi, it's gonna sound just like that.
The OEM cam chain tensioner works with a spring pushing on a plunger. When the chain stretches, gets some slack in it, the spring allows the plunger to move out one notch and take up the slack in the chain. If the slack is enough to make the chain rattle a bit, but not enough to allow the plunger to extend, then you hear the rattle. There's very little to fail on them and cause problems. Most people hear the rattle and will tell you the tensioner is shit. I've adjusted the OEM one a few times and it's pretty straight forward. Putting a manual tensioner can lead to serious
motor issues if you don't know what you're doing and put too much tension on the cam chain. That's why they're typically used in race or built-up motor applications, not your typical street bike. An over-tensioned cam chain is much worse than a rattling one!!!
So don't let that scare you away from the bike in question! Good luck with it!