Stand-up paddleboarding through Prague sounds crazy but it's totally legal and the water's surprisingly clean. Rent boards from companies near Kampa Island for around 400-500 CZK for two hours.

You literally paddle past Prague Castle and under Charles Bridge - completely different perspective than walking tours. Early morning before boat traffic starts is ideal. Current is gentle, perfect for beginners.

Water temperature stays cool even in summer so wetsuits are worth it if you're prone to falling in. The river gives you this peaceful city experience that feels impossible in tourist-heavy Prague.