Hi daily if I were you, and you are mega frazzled and have a free night at the Hilton, I would go to the nearest one that's decent and spend it there (find one with a pool, spa). Spend the money on a spa thing in house or nearby. Go for a nice swim in the pool. Nice meal.
In my opinion, if you have to travel far, you'll be desperate to make sure you 'enjoy' yourself and if you don't know the area it gets more stressful. And of course there's the travel factor (jams, petrol, etc).
I stayed at the Hilton near Peppa pig and we went to Peppa pig world. We were 4 of us. As ppw closed at 5 that was great. Gave us time to get back to hotel, enjoy it a bit. Had dinner. Nice bed. Enjoyed the evening. Woke up next day, breakfast included, went to ppw again and came home.
I've just spent £2500 on 7 days in Greece for 4 of us. 

I'm still having to book flights to Asia for 3 of us. Just because I won't have this amount of time off again and I want to go... Is that unreasonable?!! 