Nusa Lembongan

Nusa Lembongan is a small island off the southeast coast of the main island of Bali. Quickly becoming one of Bali's most popular attractions, this island paradise is a world away from the hassle and hectic pace of South Bali. Neither hawkers nor traffic mar the magnificent scenery; this is a fine place to just put your feet up and relax. Main activities include surfing, diving and snorkelling. The water is some of the clearest you will find anywhere, and a vivid aqua blue in colour. 
Nusa Lembongan is approximately a 30 minute boat trip from Sanur, Bali. Boats also travel to and from the Gili Islands. Depending on your flight schedule or travel plans it is sometimes necessary to overnight in Bali to make connecting boat / flight times.

Nusa Lembongan is approximately 8km² in size and is one of three neighbouring islands, the others being much larger Nusa Penida and tiny Nusa Ceningan. The three islands are separated from Bali by the Badung Strait. Some visitors may find Nusa Lembongan a little slow after the pace of South Bali. 
The climate of Nusa Lembongan is similar to neighbouring 'mainland' Bali, but it is noticeably drier, particularly in the period of May to September. The year round average maximum temperature is 28-30 degrees, with minimums ranging from 23- 25 degrees.
Wireless internet capability is widespread, with the majority of restaurants and accommodation offering FREE WiFi access to guests. There are also public internet cafes in Jungut Batu. 
Some of the internet cafes also have a download limit in addition to charging for time, so save your media streaming activities for home.

There is a small general medical clinic in Jungut Batu with a doctor & onsite dispensary. This is a perfectly good facility for treating minor ailments, but visitors with anything approaching a serious problem should get back to Bali as quickly as possible. Opening hours are erratic and unpredictable. Ask at your hotel. A small chemist on the main road stocks basic medications.
The main population centre of the island is Lembongan Village in the southern interior, and it is here that you will find the homes of many traditional island families.
Two main beach areas have traditionally attracted visitors.

Jungut Batu in the northwest is the bigger of the two, and has myriad hotels and cheap eateries. This is the area which traditionally attracted backpackers and surfers to the island. The white sand beach here is pleasant enough but nothing to get too excited about, and it is a little narrow in places. In more recent times, the hillside to the south of Jungut Batu known as the Bukit (the hill) has been developed and has attracted some higher level hotels and private villas. The views from the Bukit are perhaps second to none on Nusa Lembongan. Sunsets are best viewed along the main Jungut Batu beachfront.
Mushroom Bay to the southwest of Jungut Batu is a quaint, attractive and sheltered bay. It is an especially nice spot after 15:00 when the day trippers have returned to Bali, and it has a great white sandy beach, along with some cosy little water-side restaurants. 
Further south, the lesser known beaches either side of the Devil's Tear outcrop, known as Dream Beach, one of the most beautiful in Bali and Sunset Beach (or Sandy Bay), are increasingly drawing more visitors. The coastal landscape in this part of the island is mostly low-lying limestone cliffs, and there are some dramatic cave formations. A beautiful view can be seen from the cliff at the right side of the Dream beach, especially at the sunset.
The north end of the island is fringed by an important mangrove forest, and the eastern side of the island is separated from neighbouring Nusa Ceningan by a shallow estuarine channel.

Care is to be taken when swimming in any waters around Nusa Lembongan as there are extremely variable tides and strong currents. Mushroom Bay and the area around the mangroves in the north are safest for swimming. Swimming at Dream Beach and Sunset Beach (in particular) should be avoided by all but the very strongest of swimmers, and even then with caution. Due to strong currents and tidal changes surfing at all four breaks can be challenging for beginners. 

Nusa Lembongan is a great place to walk (approx. 4km from end to end), with paths linking nearly all the villas, hotels, restaurants, & attractions. The less developed south-western area of the island has coastal paths which provide easy walking, great views back towards Bali, and spectacular sunsets. You can cross by foot to the small neighbouring island of Nusa Ceningan via a suspension bridge. Nusa Lembongan has a diverse terrain and landscape, be aware that there are some extremely hilly areas and also long flat stretches.

Bicycles can be rented at most hotels and villas. Some of the roads are quite well surfaced, but be prepared for some very degraded surfaces in places. This is a great way to see the island at your own pace.

Scooters are widely available for rent and are the main form of transport around the island. Scooter hire includes a full tank of fuel and you are not expected to refill it at the end of the day. For those not comfortable driving themselves, willing locals are also more than happy to transport you on the back of their motorbike for a fee.

Nusa Ceningan, you'll reach it when you cross the suspension bridge

Nusa Lembongan is a great place to bring children of all ages. It's a very safe island and the locals adore children. Be sure to always supervise your children when swimming as the tidal movements and currents can cause issues when unaware of the changing conditions.
Choosing your accommodation to suit the needs of your children is one way to ensure the whole family have a great holiday. Decide if you are best suited to a resort style set up with large swimming pool or prefer the privacy of a villa with a smaller pool.

source http://www.balitourism.nl/lembonganeng.htm