What tactical/strategic decisions can you make in D&D: The Legend of Drizzt board game?
After playing the "Wrath of Ashardalon" game (same system, different scenario), the biggest strategy that came to my mind is sticking together/splitting the party. If you split the party, you can explore more rooms (hopefully getting to the boss quicker), but you have more monsters (and encounters and monsters with ecounters) to deal with. If you stay together, encounters that affect a whole room can cause a lot more headache.

Having only played a couple times, I'm certainly no expert on it, but I'd say choosing how to split the party is a main tactic of the game.