Thank you for your thoughtful consideration to use plastic by the pool. This is imperative for life by a pool and really any where that bare feet are the norm.
We have a ton of plastic cups in the glass cabinet to the left of the stove. They are multi-colored so you can keep track of your cup which is a benefit and will help when you have a house full of folks not have to be in the kitchen washing dishes all the time. We also have a set of red Solo cups to the right of the refrigerator. These are great to take to the beach or for a traveler while you walk but please try and return and wash them so other guests have the same opportunity.
We also have plastic (melamine) plates for use by the pool (the ones with the flowers) and a bunch of bowls, serving trays, etc so you can enjoy a meal by the pool as well. The melamine cannot go in the microwave which is a bummer but we were not able to find a quality plastic that could. Let us know if you know of some.