I will be heading to Cozumel the last week in May and need to complete my SSI checkout dives while there. The brunt of my question is pretty much this: it's cheaper (~$170) to do my checkouts with a company that does them from shore. Several other companies offer 2 tank boat dives to complete the certification for a little less than double the cost; $250-$300. Do my checkout dives consist primarily of testing such that I wouldn't get much enjoyment out of the scenery on the boat dive, or do you folks recommend I do the 2 tank boat dive?