  We compute tree level scattering amplitudes involving more than one highly
excited states and tachyons in bosonic string theory. We use these amplitudes
to understand chaotic and thermal aspects of the excited string states lending
support to the Susskind-Horowitz-Polchinski correspondence principle. The
unaveraged amplitudes exhibit chaos in the resonance distribution as a function
of kinematic parameters, which can be described by random matrix theory. Upon
coarse-graining these amplitudes are shown to exponentiate, and capture various
thermal features, including features of a stringy version of the eigenstate
thermalization hypothesis as well as notions of typicality. Further, we compute
the effective string form factor corresponding to the highly excited states,
and argue for the random walk behaviour of the long strings.
