GH5 + lense question for Alaska cruise

I have a GH5 I picked up in 2019 with the leica 12-60 lense. Has been performing really even if I'm not using some of the hardcore video features. Heading over to Alaska end of August and was looking for a good complimentary lense, maybe a 'good enough' one lense solution.

Looking for any ideas of what is out, haven't really payed much attention since I bought the camera