Speaking as someone who spent a lot of time in malaria areas, often without meds, I would agree with most posts here. One thing to look out for, as explained to me by the medics and borne out over 2 decades of observation since:
Western tourist type people die from malaria because it is not diagnosed. The usual sequence is that the person takes prophylaxis, has a holiday and comes home. Malaria has an incubation period, so at some future point they develop symptoms (like cold/flu). They self-medicate for a week or two until they feel really terrible, then they go to the doctor.
Usually they are not thinking malaria (I took meds, must be fine!) and they don't tell the doc that they were in a malaria area. They progressively get worse until eventually someone makes the correct diagnosis by which time there is usually serious liver / organ damage or they get cerebral malaria and then its not good at all.
The secret is to be TOTALLY paranoid over malaria for up to a year after your trip. If you get cold / flu symptoms that dont go away after a couple of days, go get a malaria test. They are quick, cheap and effective. If you have it and you have only been symptomatic for a couple of days, chances of successful treatment are very good (ask me, I spent 4 days getting jabs and malaria all gone).
This is regardless of whether you took meds, many strains are resistant to a lot of the meds out there.
I am not a doctor, I do play one at home if I'm lucky so hopefully someone like
@Duke Dive Medicine could chime in. I also suspect that some of the meds may not be conducive to diving, Lariam made me loopy and one of my colleagues had a breakdown from that stuff. There is also a question mark over Doxy use, it's an antibiotic and there are a lot of issues being raised over antibiotic use causing drug resistant illnesses to proliferate etc, I personally try to avoid "unnecessary" AB use.
Long clothes, spray and don't take chances when you get back, enjoy Indo I'm terribly jealous!
