I've been to Maho twice (but not recently) and don't remember bugs being a big problem -- they certainly weren't as bad as in my backyard in the summer here in New England. There usually are a couple of little geckos in each tent that help by eating the mosquitos!

As far as noise from building machinery, I think there are only a couple locations that could potentially have that issue -- those near the pavilion or store (parts of sections D and E). I stayed in section B each time, and the only noise problem came from nearby families. After about 8 pm it gets very quiet most nights.