Why not take a jeep safari to the seven lakes starting from borovets.Minimum of 3 people and and only 5O.OO leva per person not including lunch.7O.OO leva with lunch included.Not a bad way to spend the day or what about horse trekking.If your the outdoors type why not visit borovets in the summer.Accomodation is greatly reduced with plenty to choose from ,and you just need to sort a flight out.
Fiona