There’s a majestic river flowing through the city, so it makes sense to do something on it while you’re there. On Slovansky Island you can rent a boat of your choosing. Prices vary depending on the size of the boat (they can hold anywhere from 2-6 people) and how long you want, but like most things in Prague it’s reasonably priced.
Paddle boats are however a super way for a couple to explore the river and Prague itself. Passing by Prague Castle provides one of the most romantic views, but a paddle boat isn’t just for lovers — it’s one of the great activities in Prague for families to relax, away from the hustle of the Old Town and enjoy Prague’s beauty.