I would look into the day trip (via boat) to Praslin / La Digue that Labriz offers. It is pricey but may be worth it if on a time crunch. Labriz is a better overall property that Northolme, but the new pool villas at NH look breathtaking. I would not waste money at Four Seasons for one night. If you want to really splurge for one night, look into Maia (all-inclusive) on Mahe.
No matter what you choose, Seychelles will change your life for the better. Enjoy!