Yes, you can tube down the spring run into the santa fe river, just watch out for canoes and kayaks.
Not recommend to tube THE RIVER itself. The spring run is fine but it's very short... 5 - 10 minutes. Heading out to the Santa Fe River in a tube is gonna make for a long day. The current will carry you down river and there is no place to re-enter into Blue Springs. Meaning... you'll have to drift down to Ginnie Springs (30-60 minutes), pay the Ginnie park entrance fee, and then get a ride back to Blue.
Thanks! Your answer is awaiting moderation.