Activities in Sinaia
A good source of equipment and information in town, Snow, near the cable-car station, hires skis and bikes in summer. They offer ski instruction services. Check out the 1930s skis on the walls of their shop. Their outdoor/indoor Romanian restaurant is about as good as the centre gets. There are ham-and-cheese pancakes and a vegetarian platter, plus several breakfasts (but skip the disappointing coffee).
There's a rental outlet in Bucegi that rents bikes, skis and snowboards.