Check into your hotel before heading to the park. While the parking lot is patrolled there is always excessive movement with people loading and unloading so they may not be able to differentiate between families and thieves. If you are staying on property you are able to leave your luggage prior to actual check in time.
No place to store at the park. If you have a rental car it should be safe (not a guarantee) because the lots are patrolled.
Only small lockers for backpacks and such. I don't think a carry-on will fit
keep it off park grounds safer and cheaper
You better go to your hotel first then to tje park
Store it at your hotel if staying on site.
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