Recently did the same, the political situation is not an issue if you still to bali, but Lombok was pretty bad when i was there.
Stuff is cheap, you could realistically live on less than $20 a day, and eat out 3 times in that. Waves were disappointing when i was there, i went to Padang Padang and some of the other famous breaks, but found them to only be 2 foot well shaped swell. better luck with your wave hunting.
I was offered pot in the street at least 6 times in a week, always from locals, who looked suss to say the least. I stay steer away from locals if your gunna buy, i think they'd rather mug you than sell you quality drugs.
Alcohol is dirt cheap, but the local versions of the spirits are pretty harsh. Most of all, use your head, be safe and have fun
SD
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"I wouldn't recommend sex, drugs, and insanity for everyone, but they've always worked for me." - Hunter S. Thompson