With my brother Dominic being deaf and only 15, finding activities that everyone enjoyed during his visit was challenging. We spent most of the weekend taking photos, it became a visual middle ground that mitigated some of language barriers. Plus, I was testing out my new camera. In fact, giving him my camera at the gallery opening was one of the best ideas we came up with. How would you feel if you went to an art show and everyone spoke-- say Klingon. Not a single person other than your translator spoke your language. But she was busy catching up with people after recently announcing a major business departure. You'd probably find yourself needing something, like taking photos, to occupy your time (thanks for being such a good sport Dom).
Outside of taking copious amounts of photos, we also ate - a lot, watched a fair amount of the TV show Switched at Birth (which is half in sign language and half in English) and we geocached.
Geocaching is an app you can download on your phone that gives you clues and the GPS correspondence of hidden treasures. It is a worldwide community and there are goods hidden everywhere.
Sometimes you don't find what your looking for but in my experience we found most of them.
We even got lucky and found a travel bug. These little guys are taken and tracked through the website. It's pretty cool, this tag started out in New York and landed in San Diego once Dominic returned home.
I was wary at first but now I'm totally hooked. If you have kids this is a great family friendly activity.