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.
I like your comment about how “rainy seasons” are almost always overstated. I totally agree based on my own experiences and research, although there are a few places where they should be taken more seriously than others. On my most recent December trip to Bali (2.5 years ago, I think), I spent 30 days there and the rain only became a problem that one time I mentioned. It was just an insane cloudburst while taking a minibus from Kuta to Ubud, and in the end it’s actually probably my best Bali story. Aside from that, it’s very humid during Bali’s wet season, but even that really didn’t slow me down. The thing is, in Bali you are usually on or near the beach or a hotel pool (feeling the breeze) or in your air-conditioned room. Or you might be touring around to see temples and rice terraces and whatnot, and everything is outdoors and beautiful. When it does rain it’s usually over in 15 minutes, but often the rain comes over night. That kind of humidity can be a killer when visiting a city, but for me it’s a small issue on a tropical island like Bali.
I’m not really an expert on surf destinations and even less so on skate parks, although I am aware of many places that do have good surf beaches. From Ireland I think your two best bets would be either Rincon, Puerto Rico, which has the best surfing in the Caribbean and is good for longer rentals like that. You could get a reasonably priced flight into San Juan, which is also a really nice place with some surfing and great beaches, and then hire a car for the drive to Rincon.
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