Unfortunately I can only answer based on my earlier, not recent experiences. We ex-pats who lived in or around San Isidro relished our memberships to RCI's Hotel del Sur and the discounts we received on food and drink at the Hotel made other issues tolerable. There is no better gym, work out facility, in Costa Rica's Southern Zone than Hotel del Sur's.
I hore these comments help.
Musoc bus is less than 20$, from SJO to San Isidro. From San Isidro terminal when you arrive, there are many taxis around. You can offer a deal, too. But most of them use meters, I don't think it's more then 5-7$.