It's great to see you here today at the Disney Parks Moms Panel, Emily! I'm so glad that you came to ask us your question before you take off for your magical vacation tomorrow. I'm also the kind of person who likes to know all the details before I go so I don't miss anything I'm looking forward to, so let's have a look at when you'll be able to eat at one of the dining locations you want to try:
Oasis Bar & Grill at
Disney's Polynesian Village Resort.
If you want to have an early dinner at Oasis Bar & Grill they will be serving the
lunch menu until around 5 p.m. As you mentioned, there's also a
pool bar menu that you can order from until around 8 p.m. but the options are a bit more limited. For an early lunch, I would recommend arriving in the mid-to-late afternoon so you can ensure that you get to order the menu items you want. Of course, these hours are subject to change at any time so check with the Front Desk when you arrive or snap a picture of the sign outside of the restaurant so you can have the most up-to-date information.
Safe travels, Emily, and enjoy your trip!
Jessica