Is it worth using their towel and robe or can you just bring your own if not a guest?
Either way. The towels/robe came with the room so I don't know what they charge separately. It was sure nice to be able to trade wet robes/towel for dry one. Have fun!
If not a guest of the hotel, you should probably bring your own. The advantage of staying at the hotel is that it not only includes the dry towels and robes (which are fluffy and lovely!), but it also includes 24/7 admission to the springs from the hotel. For us, this made it cheaper to stay there than to stay somewhere else and pay admission for both the evening and the next morning. Enjoy!
Get an answer from The Springs Resort & Spa staff and past guests.