I'm already a scuba diver. I lost my certification card. I'm a certified diver through another training organization. I'm a scuba instructor certified through another training organization. I want to learn about scuba diving.
Snorkeling seems easy.
If you're comfortable in the water, probably not. However, if you'd like some guidance, just ask a PADI professional. Even if you take to snorkeling like a duck takes to water, you'll find snorkel tours arranged by a PADI Dive Center or Resort get you to some of the best snorkeling spots. The best way is to visit your local PADI Dive Center or Resort. Some people learn faster than others, so how long it takes you may vary.