Hotel choices in La Fortuna are numerous with something for every budget. My personal favorites that I can personally recommend are:
1) High End - The Springs is hands down the nicest hotel in the Arenal area with on-site hot springs, zoo, river and some great restaurants and bars. However, it is very expensive.
http://www.thespringscostarica.com/2) Mid level - Arenal Lodge has GREAT views of the volcano, nice pool and hot tubs, good restaurant, excellent staff and is reasonably priced for what you get. My choice when I make a personal trip to Arenal.
http://www.arenallodge.com/navegadores/home.html (On a side note, CR hater Spanky found this one)
3) Low End - Hotel Vista Arenal has decent rooms, great view of the volcano, good location on the main road around Arenal, pool, A/C, cable TV and a great staff for a pretty inexpensive price. This is where I always stay when I am working and have other clients staying overnight in Arenal. No web site and only thing I could find was in Spanish.
http://alajuela.evisos.co.cr/hotel-vist ... l-id-12280The drive from downtown San Jose to Arenal is at least three hours but traffic and weather conditions can make it longer...
A really good website for most things to see/do/stay around Arenal is
http://www.arenal.net