LUJAN (basilica, river, big museum) - 1.5 hours from the city.
SAN PEDRO (river, spas) - 2 hours from the city.
CHASCOMUS (lake, colonial) - 2 hours from the city.
MONTE (lake, small nice town)- 1.5 hours from the city.
LA PLATA - 1 hour from city: Museums (Natural Science), basilica, a different city.
Depends if you have your own vehicel or not...