If you're looking for a quick bite and a few drinks, Augusta's Water Street has a number of pubs and breweries overlooking the Kennebec River. Parking is free on Front St.
With quaint pubs, local vendors and coffee shops on the water, Hallowell's main strip, Water St, is a classic New England small town shopping center. Bintliff's Corner Brew is a great breakfast spot. Water St is a 7 minute drive from the hotels.
This is a paved trail popular with bikers and runners. It follows the river south - starting in Augusta, stopping in Hallowell (2 miles one way), ending in Gardiner (6 miles one way). Pairing this walk with a little shopping in Hallowell would be a great choice for a day trip. Front St in Augusta has parking available to enter the trail and is a 5 minute drive from the hotels.