Jan 14, 2017 - 10:59 AM
Hi MayaC, welcome to MySwissAlps!
I think you'll love Grindelwald at that time of the year. It's not high season yet, so it will be less crowded than in July and August, and nature is splendid. As for your questions:
1. Most cable cars such as First and Männlichen will start running by end May, so you can visit most mountain tops near Grindelwald. Whether you can make hikes at higher altitude strongly depends on weather and snow conditions. Generally the higher hiking trails will still be inaccessible. Valley walks near Grindelwald, Lauterbrunnen and along Lake Thun and Lake Brienz should be perfectly possible though.
2. Please find our recommendations at our Grindelwald and Jungfrau region pages. Many children enjoy the cable car, train and boat rides, but of course I don't know whether your kids will love them as well.
3. Our hotel and rental pages may help you out. In case you can't find what you're looking for, please post in our accommodation forum and add further criteria.
Does that get you started?