Last year I did one of those backpacker type experiences (aka a tour) of Lombok and had a good time. We did a couple of hikes in rice paddies and to waterfalls, visited various villages in Lombok, and spent two nights on Gili Air, the kind of middle developed island. We had a snorkeling trip included that took us around all three of the islands. It's probably not the best snorkeling or diving in the region but I still enjoyed it.