It's not too juvenile. There are a few activities that are "young at heart". I'm in my late 50's and loved them all. There is always something else to do if you don't want to partake.
We took our netbook and could use it only a few times. In Stesa we bought an internet card from the front desk for 5 Euro for 30 minutes. It wasn't much time but worth it to keep in touch. The 30 min. can be spread out during your stay there. In Zermatt, the hotel was having issues with connectivity so we were able to only connect a few times. Hopefully it's fixed by now. We bought the internet card again in Lucerne. It was 5 CHF for 24 hours service, it ended each day at midnight.
The hotels are wonderful, the food is fantastic, very few disappointments, the scenery is absolutely amazing and you will LOVE Jason and Marco. I can't say enough about those two. Just the best.
Hope this helps.