For a trip to Bali (Indonesia) there are no compulsory vaccinations for tourists, but some jabs are often recommended. Important: always get personal advice from a travel clinic, a public health service or your GP — it depends on your trip length, destination and health. The below is general information.
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In the tourist part of Bali the malaria risk is low; malaria tablets are usually not needed, but check this for your route. Dengue does occur, though. There's no tablet against it; good mosquito protection is key: use DEET, wear covering clothing in the evening and sleep under a mosquito net/air conditioning where needed.
Book your appointment at the travel clinic well in advance — some vaccinations need time to build up or consist of several jabs (a few weeks beforehand, for instance). Put 'visit travel clinic' on your travel checklist.
Depending on your plans, a travel clinic may also discuss hepatitis B (longer stays, closer contact), typhoid (via food and water), rabies (relevant if you'll be in rural areas, cycling or on a scooter, or staying a long time — Bali does have rabies in animals), and Japanese encephalitis (mainly for longer rural stays). Making sure your routine DTP and MMR cover is up to date is the sensible baseline for everyone.
Good news: Bali itself is considered malaria-free, so anti-malarial tablets usually aren't needed for a standard Bali trip (some other parts of Indonesia differ — get advice if you travel on). Dengue fever, however, is present and spread by daytime mosquitoes, and there's no tablet for it — so mosquito protection matters: repellent with DEET or picaridin, cover up at dawn and dusk, and use screens or a net.
See a travel clinic, public health service or your GP six to eight weeks ahead, as some vaccines need time or multiple doses. Bring a record of what you've had, pack a small medical kit, and remember that this page is general information only — your personal advice depends on your health, trip length and exactly where you're going.