I visit Lao PDR a couple of times each year, and I've never failed to enjoy my stay there. Although small and having the feel of a village, I could quite easily move to Vientiane and live there. It's such a contrast to other capital cities and you seem to have explored the main attractions during your time there. I really do love Buddha Park, and glad you made the visit.
Yeah we really had a great time in Vientiane. The only thing we didn't do while in Laos is we didn't go to Vang Vieng which I heard is amazing and we also missed out on Luang Prabang but we will definitely go back Laos and explore these other towns.
Vang Vieng is amazing, and I tend to spend a couple of weeks there each Winter. Luang Prabang is beautiful, but a little sleepy if your looking for adventure. Both well worth visiting though.