My number one tip for this experience is to do everything LONG before you think you need to. We booked our June trip back in December 2017 and I had been doing research because going to the Statue of Liberty and Ellis Island was at the top of our list of places to visit. I booked our crown tickets back in January 2018. When we were on Liberty Island we had been told that crown tickets were sold out until November 2018. There were several groups of people who tried to get up to both the pedestal and the crown without tickets. Book early and cross your fingers for good weather! I would also recommend buying tickets for early in the day. We bought tickets for 9am which was a perfect time. The lines were short for will call and for security and it wasn't that hot out yet. We arrived at 8:30am and were in and out of will call and security in 10 minutes. The staff aren't the friendliest people I've ever met but do they really need to be? They just want to keep everything moving and I'm sure they deal with plenty of ridiculous people each day. We got on the boat and left at 9am on the dot, which is another good thing about going early. The boats held far more people than I thought they would have, so even if you see a long line, the boats come frequently and can hold a ton of people. The boat first goes to Liberty Island, then to Ellis Island, and then back to Manhattan. The boat rides are quite short and offer amazing views. I would also recommend going early because Liberty and Ellis Island have a lot to see, and the earlier you go, the more time you will have and the less crowding there will be.