Vidhi
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Devil's tear is a must visit place, it's right next to the dream beach. They have an entry ticket, but it is seriously worth it - they have a proper park, you might see kids playing skateboarding outside and some joggers inside. Go during the sunset time! The sky was so vibrant. It's pretty big, they have good sitting area as well, can bring some food and relax, watching the waves hits the rocks and mist spreading around.
The snorkeling trip was great! We saw corals, fishes, turtles - weren't lucky enough to see manta rays though.
Here the shops have much better and unique collection compared to the streets of bali, might be little bit more expensive but they give you good bargain as well.
There aren't any pure veg restaurants though, given it's a small island.
Can spend a day or two max. We later rented scooters and went to ceningan, covered the whole island in just 4hrs, should definitely do this if you are staying in lembongan. On the last peak point of the island, there a nice cafe from there you can watch surfers - it's good place to chill nice music and food also.