1- [edit, can't do multicatrs] Final fantasy would pass the time.
2- Hotslot (Some female companionship is nessesary when you're alone on an island)
3- Battletoads. If I play it long enough I might actually beat it.
- Legend of Zelda is a must. Nice long game, and 2 totally different quests will keep you from going nuts on that island
- Donkey Kong Classics a good one too since the replay value will never die. It's technically a multi cart I guess, but I say it counts anyway. Two games in one!
- Ice Hockey would be perfect. It'll keep your mind off the hotness of the island and you can get a lot of mileage using different teams and skaters for your roster. You could even get creative and do an entire season with stats and a playoff tournament