Hi Didi,
I am sure you will have a lot of fun on Curacao!
The next market (a so-called mini-market) you will find in Barber, that means driving for approximately 15 minutes from the Lodge. Entering Barber take a right turn at the bank. The market will be on the right hand side. You can also continue a bit in direction to Willemstad, and you will find California supermarket and another mini-market in Tera Cora (20 minutes driving).
For car rentals you can contact Go West Diving (the dive shop right beside the lodge,
diveshop@oceanencounterswest.com) - they might be able to help you there; if things haven't changed they have cars for rent on site.
The shore diving on Curacao is nice and easy, there are lots of posts on this forum discussing the different dive sites. You can get a lot of advice as well as a dive & drive map from Go West Diving. Personally, I prefer the 2 sites in Westpunt, Playa Kalki (right in front of the lodge) and Playa Piscado (right in front of All West Apartments - fishermen's harbor, but a lot of cool stuff to be found), and the sites of the San Juan area, Playa Largu and Playa Shon Mosa. Playa Lagun is also very nice. There are good sites also in the east of the island, like the Superior Producer Wreck, Playa Marie Pompun, or Director's Bay / Tugboat. Expect to spend more time driving around than on Bonaire (Curacao is twice the size of Bonaire, and there is no coastal road like in the south of Bonaire that you just drive along, stop wherever you like, and hop in the water, so you have to take some detours to reach the dive sites), but you will find more smooth and esay beach entries. I have heard many SB members say that they think the reef architecture of Curacao is more diverse, while you see more / bigger fish on Bonaire. I haven't been to Bonaire since 1999 - after my first visit to Curacao (in 2004) I didn't see the incentive, yet back then I found that the differences underwater in my opinion are neglectable. How things may have changed, I cannot tell.
There are also wonderful sites to go boat diving: I recommend Rediho, Mako's Mountain, Scooter, Watamula, and Paradise (offered by Go West Diving), and East Point (offered by Dive Charter Curacao and Ocean Encounters). I don't know if it's because they see less divers than the shore dive sites, but
on average I always felt the coral to be in a better shape at the boat dive sites.
Whatever you choose to do, have a lot of fun on Curacao with your group, and say hi to Sunshine and David at Sol Food (
Curacao Sunshine - Rental Property on the Island of Curacao); they offer great food, and a fun atmosphere, on the weekend days!
Greetings from Cologne, Germany
Andreas