Just finished Bard's Tale. Highly recommended if you didn't play it yet.
Volsung said:The main quest line takes you back to Candlekeep and eventually you get back outside and know who to face next. This is when I take a detour and go to Ulgoth's Beard to complete the expansion quests including Durlag's Tower.
After that, you can go back to Baldur's Gate and start the final stretch.
Be prepared. Tales of the Sword Coast is a juicy, old-school expansion taking up more than 10 hours.