Sinaia is on a busy rail line between Bucharest (126km/78 miles) and Brasov (48km/30 miles); there are regular connections with both. If you plan a day trip from Bucharest, catch the morning InterCity train (between 9:45 and 10:15am) to Sinaia, and return to Bucharest on the 5:48pm. Another possibility is to stop in Sinaia and continue to Brasov by fast train at 3 or 6pm.
Sinaia is pretty much a walker's town. If you're self-driving, ensure that your hotel has parking (those reviewed here do), as traffic can get frustrating in busy periods. Taxis, buses, and maxitaxis are available for trips into the hills.
At the town hall, you'll find the tourist information center, B-dul Carol I 14 (tel. 0244/31-1211). Adventurous types can ask after hikes into the surrounding mountains; it may be worth hiring the services of a guide.
In winter, you can get information and hire equipment for snow-based activities from the aptly named ski school and shop, Snow, Str. Cuza Voda 2a (tel. 0244/31-1198); beginners can sign up for inexpensive private lessons. Experienced skiers have only to join the queues for the cable car (tel. 0244/31-1674) behind Hotel New Montana.