Here are some symphonies that have a lot in common with Dvorak: "folksy", tuneful, upbeat.
1) Kalinnikov, symphonies 1 & 2. The Jarvi on Chandos is unbeatable.
2) Fibich, three symphonies. Another Czech - you'll love it. Again, Jarvi on Chandos is the only way to go.
3) Glazunov -- more Russian, but do try symphonies 4 & 5 to see it he fits you needs.
4) Raff. Now you've probably never heard of him, and that's understandable and unfortunate. Some of his symphonies are just marvelous - tuneful, exciting and very "folksy". WHile some of the symphonies are justifiably forgotten, numbers 3 & 5 are wonderful. Get the Tudor recordings if possible.
5) Goldmark: the Rustic Wedding Symphony is great. There are no bad recordings except for the Bernstein (he makes cuts). The Naxos is superb.
6) From England, there's Charles V. Stanford who wrote 7 wonderful symphonies very much in the Dvorak style -- graceful, tuneful and thoroughly entertaining. The Chandos cycle is tops. There's a competing set on Naxos, but I don't think it's complete yet.
Happy listening. I hope this helps.