Hello Echo!
Thanks for stopping by the Disney Parks Moms Panel! I completely support coming in early and taking advantage of a pool day. We like to break up our park days with a rest day to energize us for more attractions!
Your
Walt Disney World Theme Park tickets aren't linked to when you check-in to your Walt Disney World Resort hotel, unless you purchased a package, so you can use your tickets when you'd like. Just keep in mind that they do expire within 14 days of the first use. Also, if you receive your MagicBands ahead of time, then you can use them to get into the theme parks or you can stop by the Guest Services window, and they can give you a card to use for entry.
I hope this helps. Also if you're visiting in June, you'll be at Walt Disney World in time for
Incredible Summer! Edna Mode, Star-Lord, and Gamora...it's bound to be one super summer.
If you have any other questions, please come back and see us real soon!
Tania