Is 24mm wide enough on a FF for Iceland

Hi,

I'm driving around the Ring Road in Iceland for a 10day vacation next month and only want to bring 3 lenses to keep the weight of my camera bag down.

I'm bringing my 70-200/2.8II with converters for wildlife and portaiture, a 35/1.4 as my general walk round/low light lens and I need to decide on a wide angle for landscapes. I own both the 16-35/2.8II and the TS-E24II. I would prefer to bring the TS-E24II as I have owned it for a year but barely used it for my work. However, I worry that this will not be wide enough (on a FF camera) for some of the stunning landscapes I hope to encounter, particurly the waterfalls up close. I can stitch together shifted images for the odd photo but would rather not make a habit of it for every shot - this is a vacation!

I'd appreciate the advice of the community, thanks.