Its Houseparty Holidays, which block-book small hotels for exclusive use, are bestsellers; a week in a Turkish hillside retreat above Oludeniz this summer costs. in a gorgeous St Lucia setting. A week all-inclusive costs from £2,159pp, Its Houseparty Holidays, which block-book small hotels for exclusive use, are bestsellers; a week in a Turkish hillside retreat above Oludeniz this summer costs. in a gorgeous St Lucia setting. A week all-inclusive costs…