Planning dry-season dates in Nusa Lembongan still means checking the specific room, activity and crossing you want. A seasonal label does not confirm conditions for a particular day at sea.

Start with dates and available rooms
Send the nights you want and any alternative dates to the team. Compare accommodation options and ask what can be confirmed for the whole stay. If one room type is essential, settle that question before building an itinerary around it.
Check the activities separately
Yoga availability, surf sessions and snorkeling routes have different requirements. Tell the team which experience is most important to you and ask about provider availability. Do not treat sunshine or a dry-season booking as a guarantee of calm water, visibility or wildlife sightings.
Use current information for ocean plans
The official BMKG maritime service publishes weather, wave and tide information. Check current forecasts near your trip and follow the boat operator's and activity provider's decisions. A forecast supports planning; it does not replace the provider's assessment.
For background on possible snorkeling locations, explore the Crystal Bay snorkeling guide and Mangrove reef guide from Manta Nusa Lembongan Snorkeling. Confirm the route with the operator; reading about a site does not mean it will be included on your trip.
Leave flexibility in the proposal
Ask how an ocean session would be adjusted if conditions change and what other confirmed plans could fit that day. Read the transport guide before fixing arrival or departure activities. Your retreat inquiry should include the dates, room preference and priority experiences so availability can be checked together.