A very good idea.
It comes with Chrome which can be sync'ed with Desktop Chrome (which is optional). Other than phone-oriented miniature browsers (such as Opera mini, Dolphin mini), it's the fastest browser.
One thing to remember: In order to gain access to the Nexus' folders from PC when connected via a USB cable, you need to do 2 things.
- USB Debugging Enabled
- USB Media Device (MTP) Enabled
I believe MTP is enabled by default. If not, you can go to "Settings -> Storage" and click on the upper right corner for options. Choose MTP.
For USB debug mode, you need to go to "Developer Options" and check on "USB debugging." As of Android 4.2, Google hid developer options for some reason (i.e. not visible in the Settings) but you can get it back through a silly method. Go to "Settings -> About tablet" and look for "Android version." Tab a few times and you will get a silly message saying "You're 4 steps away from being a developer!" or some such. Just keep tapping and be proud to be a developer!
Once that's done your Nexus works just like a USB thumb drive when connected to a PC. You will be greeted with familiar folder structures like Windows Explorer. Many people like
Airdroid as well. It lets you access the Nexus in a web browser via WiFi in a ridiculous simple manner.
There are tons of apps and games for your kids to choose, but keep in mind the storage is not unlimited. Big games can eat up the storage very fast. Android lets you check up on storage usage under the settings so you can check on it as the storage gets filled.
One app I'd recommend is Autodesk's
Pixlr Express. There are many free/non-free image editing software, but I find it one of the best. It doubles as a camera launcher on Nexus 7, so you can pass on additional camera launchers. (Nexus 7 doesn't ship with a native camera app)