Yes, you still need to exfoliate - dead skill cells can actually make the skin look duller and less glowy - but do so very carefully to avoid scrubbing away your tan. Ideally you will have exfoliated before you left for your holiday, so now all you need is a gentle top-up. Try using a dry body brush or an exfoliating shower sponge like those from the Konjac Sponge Company. Exfoliators with glycolic acid and salicylic acid will cause your tan to fade, as will hair removal lotions and waxing - basically they remove the top layer of skin, the tanned bit - so steer clear for now.