How to stop needless HOA spending on projects?

Our HOA Board wants to build a new building attached to our open area cabana. The capital cost will be around $150K. This is new construction. Many in the HOA community are against it in the poor economic environment because it will require an assessment to build this. The HOA board (3 persons) are stating that they do not need member approval to do this. The room will be 30' x 24' which seems small to me for a community of 160 homes. They claim maximum occupancy is 70 persons which seems high. They want to install a kitchenette and a granite bar area which will use up some of the room. Can we stop this needless spending when more than 50% of the condo community do not want this area. Many are seasonal people and would not use it.