Going to be going soon, and am supremely unaware of the area
Check out the courthouse, the mission, the botanic garden, the museum of natural history if you want. Check out some hiking trails if you're into it. Walk along the beach and the pier. Rent one of those bikes with four wheels and multiple seats and ride along the beach. Walk along state street and shop/ eat at restaurants. Eat at La Super Rica.
Basically just explore and walk around. Enjoy the beach and the mountains and the landmarks. Wine tasting exists but I don't know anything about it. Check out Freebirds if you're in Goleta.