Have not been to the resort. Most dive spots are only a few minutes away. Bitung Town is on a few minutes away by boat so it is easy to shop on a daily basis for fresh food.
I met one of the owners who is a European woman.
She was pregnant at the time.
Before you leave you might want to ask them if there is anything small and special that they need from wherever your home country is.
I often bring small things that my dive hosts request like downloads off the internet of Camera Manuals (they have the Internet in that area but it is very slow compared to the rest of the world) or Memory chips for cameras or something special for the baby (different baby).
Do as many night dives as you can. Pantai Parigi is a very shallow site in a cove at Lembeh Island which is a good night dive site and is not far from your resort. We saw Hexabranchus sanguineus (Spanish Dancer) nudibranch on both dives. It was a measured eight inches long. Also saw a crab spawning. The "big" stuff comes out at night to hunt!!!!
Be sure to bring a small light for daytime use.
You will have a great time.
Do not forget the international airport departure tax (different for every airport). For Manado it was 75,000 rupiah (about US $8) payable in cash at a counter after check in and before going upstairs to the departure lounge. I am not sure what the domestic tax is (e.g. if you were flying back to Jakarta or Bali, instead of direct to Singapore).
If you have not booked your flight yet, I recommend avoiding if possible Jakarta.
Silk Air from Singapore is very good and a subsidiary of Singapore Airlines, so if you fly to Singapore on Singapore Air your Silk Air will be cheaper than if you purchased it separately and you will have piece of mind in knowing that essentially only one airline is handling your luggage.
For example, if you fly LAX-Singapore (via Narita, Tokyo, I do recommend the one stop so you can get out of the plane for an hour and stretch your legs rather than much more expensive nonstop from LAX, everyone ends up on the same flight to Manado anyway, so the one way really doesn't save you much time) ) PLUS you will get the PC or PIECE CONCEPT system for luggage allowance (your ticket will indicate PC if it is Piece Concept and if Weight Concept it will say 20KG, or if business or first class it could be 30KG). So if you flew LAX-SIN-MDC you would get a carry on and two pieces of checked luggage (30 KG or 70 lbs each)
This is because you have an essentially continuous flight from North American (Area 1) (US/Canada) on the same ticket (or set of tickets). If you your had a stopover (other than the time needed to connect, it would break the continuous flight requirement) Otherwise you would get the standard international weight concept 20Kg. (about 44 pounds) allowance Total (for both bags).
From Silk Air web site Note: Customers traveling to and from Area 1 (USA, Canada) on the same ticket will have the piece concept applied at all points in the itinerary.
Also on a big plane like a 747, if you order a special meal you will be served first.
If you are bringing any US dollars cash be sure the banknotes are as crisp and new as possible. Visa on Arrival is available for most countries is payable in US cash US$25 and good for 30 days. Some neighboring countries get free visa.