Annapolis Boat Show staying in Bowie ,
Christopher's in Crofton
Tsunami in Annapolis - Asian Fusion
Yin Yankee Cafe in Annapolis - Asian Fusion
Joss in Annapolis - Good sushi
Ram's Head in Annapolis or Crownsville - pub food - it's a local microbrewery.
Sputnik Cafe in Crownsville - some sort of fusion food but heard it's very good.
Adam's Ribs - multiple locations (Edgewater, Eastport, Severna Park and other locations) for awesome ribs and pork bbq sandwiches
Jerry's Seafood in Seabrook.
Harris Crabhouse in Grasonville (avoid Cantler's, which is overrated).
for Indian, a bit away from Bowie, but within your limit at Langley Park
For a local chain option, there's a Duclaw's in Bowie Town Center which is a microwbrewery.
FYI, I would scale down your radius to about 15 miles. 30 miles from Bowie takes you well into DC, and that's another world of possibilities.