I went to Bali two years ago. If you are at Kuta beach and your hotel is near to Denpasar airport you can walk to the airport over the beach. If you have enough mm you might be able to take some nice landing and taxiing shots. Its very hard to come close to the runway (it was easy a couple of years ago) due to security reasons (you remember a bombing in 2002 by militant Islamists in the tourist area of Kuta?)