I really don't think this is going to work very well. But, for $2.99, the time they spend trying, is well worth it.

perfect summer toy! I'm sure my nephews will want this one :)

There has been a sustained effort in trendy parenting circles over the last few years to make this kind of thing interesting to American kids (in the way that it hasn't been in 50 years). You might be surprised how fun a natural wood boat powered by the air from a balloon can be for a little kid.