Those who are interested in everything nautical will enjoy Gili Trawangan Harbor. It's a lovely place to go for a wander by the waterfront and admire the boats.
This place for ships to anchor is free to enter, which is great news if you're watching your budget. Gili Trawangan Harbor is located in Gili Trawangan. When you've finished here, Gili Meno Turtle Sanctuary, Gili Trawangan Turtle Hatchery and Bangsal Harbor are nearby and also worth checking out.