Delta Spa is located on Jln Dewi Sri, in the Legian area, near to the junction with Sunset Road. It's also near Sunset Star which houses a Starbucks and MacDonalds.
I think that giving too much information will actually spoil the experience
Like all spas, they have a range of services, including pool, sauna, etc. If you just want to have a good massage, they have a few packages. And like I mentioned, do go for the Deluxe package. I recall that it was about 900,000 Rp.
Sounds expensive, but what you get is 2 hours of enjoyment! The massage itself is above average, and the HJ (included in the price) is more shiok than just your typical rub-and-tug. Then to end it, there's a 15 min "Water treatment", which (after you get over the initial pain
) is quite stimulating and different.
Enjoy bros!