One thing about Cancun that is interesting. Cancun itself is essentially a very long beach sticking out into the Caribbean that is lined with high-rise hotels and time-share properties. Except for a busy area at the corner of that peninsula, most of the hotels are spread out quite a bit, so there aren’t many things that most guests can walk to. Many people love it and are happy to basically stay in their own hotel most of the time, and maybe take a taxi down to that busy corner area once in a while. Personally, I’m a much bigger fan of Playa del Carmen, which is a full-on tourist town about 50 miles south of Cancun. It’s got hundreds of small hotels, restaurants, bars, shops, and everything else a visitor wants. The beaches aren’t quite as nice, but I find the town to be very fun and vibrant. Also, up and down the coast from south of Playa del Carmen to north of Cancun there are large resorts that are far from each other and on huge properties. Many of them are all-inclusive, so that is another option.
If you are referring to days trips and that sort of thing, it will be much cheaper if you book once you get there. In Vietnam in particular it’s amazing how cheap tours can be if you book them through your hotel. I once did a 6-hour bus tour to Mỹ Sơn, which is near Hoi An, and I think I paid about US$6. It even included a boat ride and a basic lunch. That same day tour online would probably cost US$30 because the booking company takes a share and there is very little competition.
In Laos, Luang Prabang is a really lovely city, and Vang Vieng is nice, but Vientiane is kind of plain and probably not worth a stop. I don’t think I’d recommend Laos for a multi-generational trip, unless you just want to fly into and out of Luang Prabang. Laos is really interesting for backpackers and adventure travelers, but it’s behind the times for family travel.
The 2nd option is a bit early in the year. The Greek Islands are cold and mostly deserted until mid April or so, and the good weather really starts in May or June. This is true in Mallorca as well. The Canary Islands are much farther south so they have acceptable beach weather almost all year, although you might get some cooler days in March as well. Even still I wouldn’t really recommend them for a younger person. In my opinion, the Canary Islands are pretty boring because the majority of visitors that time of year will be retired people from northern Europe who just want to sit in the sun. The nightlife tends to be cheesy and/or weak if you can find it at all. Let me know if you have any other questions. -Roger
Since flights to Mexico City from the US and Canada are usually quite cheap this time of year as well, this could be a perfect short cultural holiday. This city has great shopping, dining, and nightlife, and the central historic and tourist districts are far safer than most people would expect. There are ruins just out of town as well, so a bit of everything is available.