Blue Lagoon in Iceland is one to look out for with these vouchers if people can get there. Rates run at about £1000+ a night but they also include:

1) Free breakfast (probably the best quality one I've ever had in terms of ingredients.)

2) Free fully stocked minibar which can be refilled on request.

3) Complimentary/unique Spa experience.

4) Bottle of Moet in room, I ended up getting two of these as they gave it to me each night.

5) Chocolates in room.

6) Free valet parking.

7) Amazing high end toiletries that are plentiful.