The topographic maps you will be using have a contour interval of 10 ft. This means that there is an 10 foot change in elevation from one contour line to the next. On this map, the 150 foot contour has been emphasized to aid you. Observe the sinuous trace of the Connecticut River, both in the view and on the topographic map. This is the location of stop 2.
Sandy beach is a point bar.
Point bars are sandy deposits recent enough to have no vegetation on them. The cut-off of this oxbow occurred in 1840, within a historic time frame. Look at your topographic map. The meander plain is the area over which the river can and has assumed its path. To do this you will need first to calculate the maximum height above sea level that the flood waters reached.