Go to a local beauty salon and get either a spray on/St Tropez/Fake Bake, more expensive but you will get no streaks if you go to a reputable salon, and a bit of pampering is always a bonus.
Sunbeds cause a lot of damage to your skin.... but saying that, I have been known to have a few cheeky sunbeds in my time, depending on your skin colour four 3 min sessions normally get me tanned and looking like i've been on holiday. If you have got really fair skin tho i'd avoid them, or if your pregnant or have lots of moles.
Monsoon or Accessorize do nice wraps at this time of the year and normally have a huge range of colours too.