With numerous illnesses transmitted by mosquitoes, sand flies, ticks and even tsetse flies the fewer bites you get the better. Different types of mosquitoes spread different things- those that feed in the evening and overnight spread malaria and Japanese encephalitis while day feeding ones spread dengue, Zika and Chickungunya.
Wearing long sleeves and long pants means you have less exposed skin. Garments with insect repelling properties can be purchased at outdoor stores or you can treat them with permethrin. Bed nets are really helpful if treated with insecticide. You can purchase treated nets or permethrin solution from http://www.skinshield.co.nz.
Repellent on exposed skin should be reapplied regularly. Both DEET and picardin containing repellents work well. Strengths of DEET over 50% don’t repel any better but do last longer however they may be irritating on the skin. Apply repellents only to exposed skin and not over cuts or wounds.