Just back from Iceland. The massage is a neck & head massage, proper massage, girls are from Thailand. Access to the spa is free for gold & diamond, others have to pay. There is a couple of steam rooms, 4 hot tubs (one outside), a sauna & a plunge pool for those that fancy a heart attack.
The lounge is excellent with good views out over the city & beyond.
For those travelling with kids beware, you will be asked to leave the lounge when the 'happy hour' is on if your kid is under 12 - due to Icelandic legislation apparently.