One must not miss the Gondola ride in Gulmarg. After purchasing the ticket (even a e-ticket) one need to get the boarding pass. One can board the Gondola only after getting the boarding pass. There will be queue for boarding pass and local agents will keep breaking the queue. It's good to be at Gondola early (say 9AM). Then you have better chance of cutting the queue.
We were here on 24-May-2016 and had done e-bookings. It took 30-45min to get the boarding pass. It was raining and there wasn't snow at Phase-I so we directly went to Phase-II. Phase-II had tons of snow and we were lucky to get snowfall almost for an hour.

Tips:
1) Do online bookings. When weather starts getting bad the ticket counter gets closed and boarding pass is issued to e-bookings. In worst case even e-booking will not get the boarding pass
2) You definitely need the rubber shoes and snow jackets. Better to get these things before boarding. They are available at Phase-II also but will be costlier.
3) At Phase-II there is room like structure below the Gondola boarding/landing point. If someone feels too cold or if it's raining then can take shelter there.

We could travel only Phase I, the 2nd Phase was not operational due to fluctuating weather. Still, the activities even at that level were mind-boggling. Rode Snow-bike and at the highest point of the ride, experienced what "serene" means! An absolutely unforgettable experience!

While the first phase was ok, the second phase to aparwat was amazing..Be wary of touts who will try to fleece you when you reach the mountain top to do sledging and skiing..Don't pay anything more than 4k for all the stuff there