If needed, you could rent a car for just one day to do the above and use taxis for dinner "out" for the other evenings, using the car the night you have it to visit the restaurant furthest, thus most expensive taxi ride, from the Surf Club.
We have found that even with taxi fare to and from the airport and taxi fares to venture out each evening, it is less expensive in the long run than renting a car for the entire week. More on taxi fares Need help deciding on restaurants....cab fare...
Being at the Marriott Surf Club you will also find a good number of restaurants within walking distance.
There is also the ability to take a bus from the Surf Club to the downtown area which will increase the restaurant options available to you. Last I knew, the fares were $1.20 per person each way and the busses ran fairly often. We did this when our children were very young and it worked out well. I would also suggest bringing an umbrella stroller as there is a lot of walking in Aruba, even just at the resort, and the two year old may get tired out. Have fun!