G'day Butterflykisses. We've stayed at the Dana Inn on Mission Bay, and you will definitely love it. We've also stayed at Hotel Circle in San Diego and would never go back there, Dana Inn for us now. If the weather is fine, you're kids not too small (if you have any) and you're feeling fit, walk to Sea World, don't catch the shuttle. It's flat and takes about 15-20 minutes or so. On a nice day it's great and you'll walk past the Marinas and also some interesting Sea World stuff.
On the afternoon you get there, jump on a bus and head down the road to Mission Beach. It's only about a 5 minute drive. There is a fair ground there, some great little shops selling surf gear and other oddments, plenty to eat and you can watch the sunset over the beach at dusk. It's very much like a small coastal town we have here and is so different to San Diego itself. It's a nice place to see.
Vegas is easy, just walk the strip. New York New York has a great Roller Coaster and the eatery and shopping area is just fantastic. Bellagio of course has the water show which is a must see, but there is so much to see and do. The M&M Factory and Coca Cola factory are across the road from New York, and whilst they're just big shops, worth a look as well. The Medievel show in the Excallibur (across the road from New York) is also worth seeing and not too bad value. Dinner and a show as well. Vegas is sureal and so much to see and do and just explore.
New York, don't have a clue ...