How much spending money for a week in Tenerife for an 18 year old?

I'm going to Tenerife at the end of June. I was just wondering if anyone knows how much spending money I would need to take for a week. I'm in a half board hotel, so we'll only need to pay for drinks and lunch. I'm looking to go out clubbing about 4/5 out of the 7 nights. I also want to go Siam park... show more I'm going to Tenerife at the end of June. I was just wondering if anyone knows how much spending money I would need to take for a week. I'm in a half board hotel, so we'll only need to pay for drinks and lunch. I'm looking to go out clubbing about 4/5 out of the 7 nights. I also want to go Siam park and maybe another excursion (teide possibly). I was thinking around the £400 mark, but if anyone can advise on a better amount, ta very much.
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