Aside from staring with a high quality razor and shaving cream to lubricate and prevent irritation, sweeping the area with a pad that's treated with glycolic and/or salicylic acid after shaving the bikini area really helps to keep unsighly razor bumps at bay. A great product to try is MD Formulations Daily Peel Pads.

You know what I absolutely love for razor bumps and ingrown hairs is The Art of Shaving Women's Ingrown Hair Night Cream. Works fabulously!