There's an app called 'SightSpace 3D' that allows you to view SketchUp files on an iPad or iPhone (there's also a version for Android). I've got the iPad version.
There's a free basic version which allows you to view files, pan, zoom, rotate, walkthrough, etc. If you're just wanting to show the model, then the free version will do that fine.
The paid version uses Augmented Reality, so you can superimpose models on the real world, in real time, using the iPad's camera. It uses the gyroscope function of the iPad so you can move around in the model by moving the iPad - really good if you're showing a model of a room - so you can stand in the middle of the existing room & move the iPad around, basically using it as a viewing window to see the virtual room.
You can also view bookmarks, scenes, and make notes on the model.
I bought the full version about 6 months ago, and it was definitely worthwhile. I must add though, when I bought it I think the full version cost around £12; it's now £28!!! You don't have to buy the full version, though, you can get the free one & then buy additional options individually.
There are various videos on YouTube showing it, just google 'sightspace 3d'.