You are sunbathing at the beach, you have been there for a while, and your suit is dry. You are wearing a one piece swimsuit. There are no bathrooms to speak of, and you really have to pee and poo.
Pee and poo in your suit and onto the towel
Pee and poo in your suit and off of the towel
Pee in your suit, and hold the poo
Poo in your suit and hold the pee
Fold the towel up so that half of it is covering you, and half of it is under you, take the bathing suit off, completely hidden, and pee and poo in the towel
Roll onto your stomach and poo and pee, then roll back onto your back, feeling the poo mash against your butt
Spread your legs apart and pee and poo in your suit.
Squat and pee and poo in your suit
Cross your legs and pee
Ask a friend to bury you in the sand, then, once buried, pee and poo in your suit
hold them both and go to sleep
poo in your suit, hold the pee and go to sleep
pee in your suit, hold the poo and go to sleep