Tours to Laos in February are a good choice because the high season has ended, and the scorching heat of March hasn't set in yet. This means you still have time to explore all the major attractions of the country. Additionally, Laos vacation prices tend to decrease slightly in February.
In any case, visiting the capital, Vientiane, and the ancient city of Luang Prabang with its temple complexes is highly recommended. You can also consider a trip to Thampatsak for a similar experience. If you enjoy trekking, Laos winter vacations offer opportunities for hiking, especially in the Bolaven Plateau near Pakse.