To sum up: a lot depends on your own stamina because island hopping means packing and unpacking, getting on and off buses and ferries. Limit your choice of islands to perhaps one or two less than you think you can manage. Maximise transport links to avoid backtracking or port-transferring and since you are traveling high season be aware that you will usually need bookings ahead at most places. It is possible to turn up on an island and not find a place to stay or have to make do with a third-rate option.
Since St. John is part of the U.S. Virgin Islands, U.S. citizens can visit without a passport. There are quite a few bargains on both St. Thomas and St. John right now, so it’s a good choice for travelers on a budget. Snorkelers should not miss visiting Trunk Bay, one of the best snorkeling spots in all of the Caribbean for seeing amazing marine life.
Between Nydri and the next main tourism centre is the little port and beach of Mikros Gialos (small bay) that is a great little base for individual travellers for a day or three. The port village of Vasiliki on the southern underbelly of Lefkada is a haven for windsurfers: see this page or this one for more information. The little village is very pretty and is a good base for general holiday-making (as are the two other places). From Vasiliki there is a regular local ferry that runs to Fiskardo on Kefallonia (via Ithaca/Ithaki).
I’m hoping you can help myself and a friend decide where to go. We are hoping to go away around mid August for 10 days-2 weeks. We’re looking for a sunny place and beaches to tan and relax during the day, with some big nightlife and a good strip (the odd daytime activity maybe too). However we are in mid 20s so want to go somewhere with the same age group or older. I’ve been to Zante and although it was super fun at the time (I was about 18) and loved having the strip etc, just don’t want to be the older people there anymore! Money is also fairly tight, so nothing too expensive (was thinking santorini maybe before hearing the price along with it).
For the full throttle, utterly extravagant Las Vegas experience, it has to be the Strip. You’ll stay in a grown-up wonderland, in opulent, palatial surroundings, and there is nowhere else on earth with nightlife and entertainment like this. Plus, when it gets too much, you can simply retreat to your suite within a few minutes. If you’d like to be close to the action, but without the full force of the Strip’s frenetic nature, stay East or West of the Strip. Here, you’ll find some smaller boutique and budget hotels, and you’re still in easy reach of all the main attractions.