Be prepared when you arrive on Phi Phi you now need to pay a 20 Baht tax at the pier. This is to help with rubbish clearance and mitigate the costs to locals for the impact of so many tourists visiting the island. It's a small ammount but with so many visitors it's a step to help keep Phi Phi as the beautiful paradise island everyone loves.
We definitely need more bins, more ashtrays - but tourists can help by being conscious of where they leave rubbish.
Waste managment is actually quite a logistical problem in Phi Phi - the rubbish is collected at night and shipped off the island. Recycling of Plastic, cans and cardboard is largely done by locals - but sadly glass is currently too expensive to transport off the island to make it cost effective to recycle. So drinking canned beer rather than bottled beer is actually helping the island.
One of the biggest problems tourists can help with is keeping the beaches clean - especially not leaving cigarette butts in the sand. The other thing is the sheer quantity of plastic thats used - so don't take the bags if you can carry what you buy without.