Lombok has gotten more popular over the past few years. People who think Bali is to crowded but are essentialy looking for the same things Bali offers, head for Lombok. The island has tranquil countryside, one urban area ( Mataram), great beaches, a spectacular volcano and one established holiday resort Senggigi. gunung Rinjani is great for trekking, the gili islands offer some of the best snorkeling in Indonesia. Lobok’s Kuta beach has big waves and good surfing.
Add all of these elements together and you have a pretty good holiday destination. Not as crowded as Bali but with the same fun, sun and action.