You can absolutely ride a cruiser on the bike trail, you just probably won't make it as far! And midtown/downtown Sacramento are full of cruisers, particularly on the weekends.

I think the nicest thing to do here is just to be outside. We have a lot of cafes with outdoor seating, lots of parks, a couple of rivers. March is really a nice time of year here, a good time to just walk around and enjoy the weather.

(I probably just guaranteed you a storm during your visit.)