I did my check dives in Weeki Wachee and have only returned once since then as you can only get in the springs with a tour or dive class. If you have the opportunity to latch on to a class or tour, then Weeki Wachee is well worth it. The spring has a strong outflow which makes it difficult to descend, but it also makes for some of the clearest spring water in the state. The surrounding grounds are impeccable -- essentially a small, clean, and functional theme park. If you can get in to dive, then you can also spend the day in the park, so this makes for a great family outing if planned ahead of time.