In addition to Denny's, the strip mall across the street has Panda Express, Del Taco, a Greek cafe, Subway, and an ice cream place. The ballroom in the convention area next door gets chilly like at most hotels. The outside temps are probably going to be in the upper 80s, maybe 90, but dry and not humid, so I don't know nothin' 'bout insect repellent. The Marriott should have most services you'll need, including self-service laundry.
Congrats on your first flight!