A visa to enter Indonesia is required for mostly all citizens since February 1, 2004. A simple visa for tourism can be obtained by the indonesian embassies or consulates for a maximum stay of 60 days.
Tourist visa for less than 30 days
Citizens of 64 countries (including Europe, North and South America) can obtain their visa at the airport of entry in Indonesia. Visa issued upon arrival is limited to 30 days and is renewable once. The purpose of visit must be: tourism, social visit, family visit, business or official missions.
This facility is not available to holders of emergency passports who must obtain their visa prior to their arrival in the country.
The cost of the visa upon arrival in Indonesia is $U25 or equivalent in Euro as example. It is recommended to have change with you to avoid an unfavorable exchange rate (better to change money in local currency in an official Money Exchange office, look for the one giving the best rate).
The validity of your passport must be more than 6 months from the date of entry in Indonesia and sufficient blank pages, otherwise you might not be able to pass immigration.
Any foreigner staying in Indonesia after the expiration of his visa will be fined 200,000 rupiah (about $ 20) per day for the first 60 days. Beyond 60 days, the fine can go up to a maximum 500 million rupiah (about $ 52 000). The immigration authorities are very vigilant, especially at airports when boarding, and this with no exceptions. you will not be allowed to leave the country if you did not pay the fine and you may even end up in prison if you are not able to regularize the situation fast enough.
Sources: France Diplomacy and Indonesian Embassy in France.
Procedure in Lombok airport
Arriving at the Lombok LOP airport you will need to queue for up to 15 to 30 minutes depending on the number of passengers in front of you to get your visa. Just present your passport and U$ 25 per person. You can then line up for Immigration, collect your luggage and leave the airport.