Looking for information about scuba at SA and TI. Not certified yet.....questions we have are is it better to be certified prior to going? Start certification at home no finish there? Do not get certification at all but do the resort class and one dive for free? If you do the resort class on one resort is it good at another one if you are staying two weeks at two different resorts? Best time of year to visit if wanting to scuba? Are there any certifications for snorkeling? Thanks for the help!