Heading to Sanibel/Captiva Island, FL with LO this month! It's her first plane trip - she is 3. I've got some new books and little toys and snacks. Anything that worked well for you on the plane?

Also, planning on bathing suits, beach clothes, some first aid stuff, and maybe some sand toys for packing - anything that is a must-bring that you've learned from family beach vacations? Since we are flying we're kind of limited with space. It's our first flying/beach vacation and while I'm so excited, I'm paranoid we'll forget to bring something obvious.