The experience of a lifetime...
Give a voucher for a gift experience, and you may find you change someone's life. It isn't unknown for this to be the start of a whole new hobby. Many private pilots took up their hobby after being given the gift of an hour's flight in a light aircraft. Give your partner a racetrack experience and you might find he's signed up for the Caterham Academy...
If you aren't certain which experience to choose, many organizations allow you to opt for an open voucher. You just decide how much you want to spend, and the lucky recipient can select from a number of different experiences and redeem the voucher at any time within a generous validity period.